A predictive model of waterpipe smoking cessation among women in southern Iran: application of the theory of planned behavior.

BACKGROUND: Today, waterpipe (WT) smoking is a rising issue worldwide, and has taken a significant and growing share of tobacco consumption in the world. Present study aimed to explore the predictors of WT cessation in the light of the theory of planned behavior (TPB). METHODS: This cross-sectional analytical study was conducted in 2021-2022 using a multi-stratified cluster sampling on 1,764 women in Bandar Abbas, southern Iran. Data were collected through a reliable and valid questionnaire. The three-part questionnaire includes demographic information, behavioral information of WT smoking, and the constructs of the TPB along with an additional habit construct. Multivariate logistic regression analysis was run to model the predictor constructs of WT smoking. The data were analyzed statistically in STATA14.2. RESULTS: With an increase in one attitude score, the odds of cessation increased by 31% (p < 0.001). Also, with an increase of one score in knowledge, the odds of cessation are increased by 0.05% (0.008). With an increase of one score for intention, the odds of cessation are 26% (0.000). in social norms, the odds of cessation are 0.02% (0.001). With an increase of one score in perceived control, the odds of cessation increased by 16% (0.000) and inhabit score, the odds of cessation decrease by 37% (0.000). In the model where the habit construct was present, the accuracy, sensitivity, and pseudo R2 indices were 95.69%, 77.31%, and 65%, respectively and after removing the habit construct, the so-called indices changed to 90.7%, 50.38% and 0.44%, respectively. CONCLUSIONS: The present research confirmed the effectiveness of the TPB model in predicting waterpipe cessation behavior. The knowledge obtained from this research can help develop a systematic and effective intervention to facilitate waterpipe cessation. Focusing on the habit variable can play a critical role in waterpipe cessation in women.

Effect of passive exposure to cigarette smoke on blood pressure in children and adolescents: a meta-analysis of epidemiologic studies.

BACKGROUND: Hypertension is an emerging disease in children and adolescents resulting in future morbidities. Cigarette smoking is one of the most studied contributing factors in this regard; however, there are contradictory results among different studies. Therefore, the present meta-analysis tends to assess the relationship between passive exposure to cigarette smoke and blood pressure in children and adolescents. METHOD: Medline, Embase, Scopus, EBSCO, and Web of Sciences were systematically reviewed for observational studies up to May, 2017, in which the relationship between cigarette smoking and hypertension were assessed in children and adolescents. The meta-analysis was performed with a fixed effect or random effects model according to the heterogeneity. RESULTS: Twenty-nine studies were included in present meta-analysis incorporating 192,067 children and adolescents. Active smoking (pooled OR = 0.92; 95% CI: 0.79 to 1.05) or passive exposure to cigarette smoke (pooled OR = 1.01; 95% CI: 0.93 to 1.10) were not associated with developing hypertension in the study population. Despite the fact that active cigarette smoking did not significantly affect absolute level of systolic and diastolic blood pressure, it was shown that passive exposure to cigarette smoke leads to a significant increase in absolute level of systolic blood pressure (pooled coefficient = 0.26; 95% CI: 0.12 to 0.39). CONCLUSION: Both active and passive cigarette smoking were not associated with developing hypertension in children and adolescents. However, passive cigarette smoke was associated with higher level of systolic blood pressure in children and adolescents.

MPOWER, needs and challenges: trends in the implementation of the WHO FCTC in the Eastern Mediterranean Region.

BACKGROUND: WHO MPOWER aims to help countries prioritize tobacco control measures in line with the WHO Framework Convention on Tobacco Control. OBJECTIVES: This paper assessed the progress and challenges in implementing the 6 priority policies of MPOWER in countries of the WHO Eastern Mediterranean Region since 2011. METHODS: A checklist was developed and scores assigned based on the MPOWER indicators (maximum score 37). MPOWER data for the Region in the 2015 and 2017 tobacco control reports were extracted and scored. Data from similar analyses for 2011 and 2013 were also included. Countries were ranked by scores for each indicator for 2015 and 2017 and for overall scores for 2011 to 2017. RESULTS: The Islamic Republic of Iran, Egypt and Pakistan had the highest scores in 2015 (33, 29 and 27 respectively) and the Islamic Republic of Iran, Pakistan and Yemen had the highest scores in 2017 (34, 31 and 27 respectively). The indicators with the highest and lowest combined score for all countries were for advertising bans and compliance with smoke-free policies: 67 and 18 respectively in 2015, and 73 and 15 respectively in 2017. Most countries (15/22) had higher total scores in 2017 than 2015: Afghanistan, Bahrain and Syrian Arab Republic had the greatest increases. The total score for the Region increased from 416 out of a maximum score of 814 in 2011 to 471 in 2017. CONCLUSIONS: Although notable achievements have been made in the Region, many challenges to policy implementation remain and require urgent action by governments of the countries of the Region.

Third study on WHO MPOWER Tobacco Control Scores in Eastern Mediterranean countries 2011-2015.

This study was conducted to quantify the implementation of the MPOWER policies and to assess any possible changes across Eastern Mediterranean Region (EMR) countries. In this comparative cross-sectional study based on 10 categories mentioned in MPOWER report 2015 a checklist was designed. Seven questions were scored from 0-4 and three from 0-3. The 22 EMR countries were ranked and compared by their total score on a scale of 0-37. The highest scores were achieved by Egypt and the Islamic Republic of Iran. Pakistan, Sudan and Yemen showed progress, while Bahrain, Jordan, Kuwait, Oman, and the Syrian Arab Republic had decreased scores. The total score of the EMR countries had decreased compared to 2013. Thus, there remains a need for greater focus on tobacco taxation and smoke-free policies to address this retrograde step.

Smoking and wound complications after coronary artery bypass grafting.

BACKGROUND: The harmful effects of smoking on the postsurgical wound healing disturbances have been widely investigated across various surgical procedures. These effects after coronary artery bypass graft (CABG) surgery have been less explored. We aimed to investigate the association of smoking and the wound healing problems in post-CABG patients. MATERIALS AND METHODS: We compared the incidence of wound complications in 405 smokers and 405 nonsmokers who underwent an elective CABG surgery. The incidence of leg and sternal wound complications was evaluated during the first 7 d as well as at a 6-wk postoperative visit. RESULTS: One hundred fifty-six leg wound complications were noted in 132 patients (16.3%). The overall rate of leg wound healing disturbances was significantly higher in smokers than those in nonsmokers (odds ratio, 1.47; 95% confidence interval, 1.109-4.019; P = 0.010). The incidence rates of leg wound edge necrosis and dehiscence were significantly higher in smokers compared with those in nonsmokers (3.7% versus 0.7%, P = 0.004 and 6.6% versus 0.7%, P < 0.0001, respectively). We found no significant differences between the incidence of postoperative leg wound infection, hematoma, wound edema, and seroma in active smokers and those who never smoked. Thirty-seven postsurgical sternal wound complications (4.6%) were developed in 33 patients (4.1%). The overall rate of sternal wound healing disturbances was similar between smokers and nonsmokers. There was a trend between the sternal wound dehiscence and smoking (P = 0.03); however, the other sternal wound complications were not associated with smoking. CONCLUSIONS: Smoking may contribute to the disturbances of wound healing, especially wound dehiscence, in post-CABG patients.

Time trend of smoking scenes in Iranian movies during the past three decades (1982-2011): a historical analysis.

BACKGROUND: Evidence from the USA and elsewhere has linked smoking depictions in movies with youth smoking initiation. Prior research has not focused on depictions in films produced in the Middle East, however. OBJECTIVE: We reviewed the 10 most commercially successful Iranian films released each year over three decades (1982-2011) to determine trends in depictions of tobacco use over time. METHODS: Each movie was reviewed in its entirety, and depictions of smoking were recorded and classified as direct (characters holding or using tobacco products) and indirect (tobacco products appearing in the frame, but not being used). Time trends in average duration of direct, indirect and total smoking depictions were analysed using linear regression and Cohen's κ coefficient. RESULTS: The mean duration of tobacco depictions in the most commercially successful Iranian films fluctuated yearly over the 3 decades, but with an overall significant upward trend (p<0.005). The proportion of movies depicting tobacco consumption during the three decades was 36% (1982-1991), 60% (1992-2001) and 74% (2002-2011), respectively. The average proportion of total movie time for these depictions (0.75%, 1.41%, 2.08%) increased significantly (p<0.005) over the 3 decades as did the average duration of smoking depictions,(39.1, 67 and 99.3 s, respectively, p<0.005). CONCLUSIONS: The significant increase in the proportion of movies depicting tobacco consumption and in the duration of smoking depictions over the past 30 years underscores the need for increased regulation of the Iranian film industry to minimise this important source of influence on tobacco initiation in young people.

The Effect of Varenicline on Smoking Cessation in Hospitalized Patients: A Systematic Review and Meta-Analysis.

Background: Varenicline tartrate is a new and selective agonist of the nicotinic acetylcholine receptor (nAChR). This systematic review and meta-analysis aimed to determine varenicline efficacy in smoking cessation among hospitalized patients. Methods: We looked through worldwide databases such as Web of Science, Embase, PubMed, Cochrane, and Scopus. Relevant pieces of research published on varenicline efficacy on smoking cessation among hospitalized patients were discovered using proper keywords. The data were analyzed using Stata software version 14 and a random-effects model meta-analysis. Findings: Nine studies were eligible to be included in this study, with a total sample size of 2131. Generally, the point abstinence rate was significantly greater in the varenicline group than in the placebo group at weeks 12 (odds ratio [OR]=0.59; 95% CI: 053-0.65; P<0.001), 24 (OR=0.78; 95% CI: 0.72-0.84; P<0.001), and 52 (OR=0.86; 95% CI: 0.80-0.92; P<0.001). Furthermore, the continuous abstinence rate for weeks 4 (OR=0.70; 95% CI: 019-0.54; P=0.000), 12 (OR=0.26; 95% CI: 019-0.54; P<0.001), 24 (OR=0.32; 95% CI: 019-0.53; P<0.001), and 52 (OR=0.32; 95% CI: 019-0.54; P<0.001) was significantly greater in the varenicline group than in the placebo group. Conclusion: According to the high efficacy of varenicline in both short- and long-term smoking settings and considering the importance of smoking cessation in high-risk hospitalized patients, varenicline consumption could be considered as a main smoking cessation strategy in these patients.

Evaluation of the Effects of PAKDAM, an Invented Device to Get Nitrous Oxide and Oxygen, in the Consumers: A Report of Pilot Study.

Background: Since last decade, a device called PAKDAM (means clean inspiration) was invented in Iran which has been used in some cafe to prepare N2O and O2 as a new instrument instead of using water pipe. This study aimed to evaluate the respiratory and health effects of Pakdam and investigate its short and midterm side effects in users. Materials and Methods: In a case-control pilot study between September 2021 and March 2022, 152 individuals were divided into two groups: 76 consumers (case) and 76 non- consumers (control). Both groups were divided into two groups of 36 smokers and 36 non-smokers. Participants signed the participation form and filled out the demographic data questionnaire, and then their vital signs, O2 saturation, expiratory CO, and spirometry tests were recorded. Results: The subjects who used the device had a mean blood pressure of 123.71±16.11 mmHg, oxygen saturation of 97.2±1.9, exhaled carbon monoxide of 9.8±5.5, and an FVC / FEV1 ratio of 88.5±7.9. These figures in control group were (137.79±18.15) - (94.1±4.2) - (14.3 ± 9.3) and (83.9 ± 10.4), respectively. In addition to the effects on the respiratory system, consumers had lower heart rates and lower systolic and diastolic blood pressures. Conclusion: The blood oxygen level and FEV1/FVC ratio were higher in subjects using Pakdam and the amount of exhaled carbon monoxide and blood pressure were lower. This condition was more common in smokers and less in non-smokers. It is possible to see the favorable effects of using Pakdam device on people especially in smokers.

Comparison of Urinary Heavy Metals and Pulmonary Function Test in Cafe Workers Based on Exposure to Secondhand Tobacco Smoke, Tehran 2021.

Background: Secondhand tobacco smoke exposure is one of the morbidity causes but it is ignored occasionally. Various studies have shown that hookah and cigarette smoke contain significant volume of heavy metals. This study was designed aiming biological monitoring of the level of heavy metals in the urine samples of workers in smoking cafés and its association with their lung function and respiratory symptoms in Tehran City. Methods: The list of cafés in Tehran was provided, and they were divided into water pipe cafés (WPC), cigarette smoking cafés (CSC), and non-smoking cafés (NSC); and then, 10 cafés were randomly selected from each group. Sampling was performed after explaining the study and obtaining the consent of the manager and staff. A check list of demographic data and smoking history was completed and analyzed. Results: A total of 96 individuals were studied; there were 32 subjects in each group. All subjects were male. Six days a week, they worked about 10 h a day in café. The concentration of heavy metals in the groups of hookah and cigarettes was significantly higher and respiratory indices in these groups were significantly lower than non-smoking group. Conclusions: Exposure to secondhand smoke increases the urinary level of heavy metals and reduces the respiratory capacity of people and this can be highly pathogenic in the future. Comprehensive informing on human rights should be provided in this regard and smoking bans in public places must be properly enforced.

COVID-19 and Current Smoking: Worse Outcome from a Surveillance Analysis.

Background: Few studies have shown that smokers are more likely than non-smokers to have coronavirus disease 2019 (COVID-19), whereas some reports indicate that smokers are under-represented among those requiring hospital treatment for this illness. This study was designed and implemented for investigating the severity and outcome of COVID-19 based on smoking. Materials and Methods: This was a cross-sectional study implemented in Tehran and Ahvaz with all COVID-19 hospitalization patients from February to June 2021. Four categories selected for severity and worst outcomes. They are admission in the intensive care unit (ICU), lung involvement more than 50%, using more than three medications, and death. A check list of demographic data and smoking history was completed and analyzed. Results: A total of 11,112 patients were male (61.1%), and the mean age was 47.9 ± 11.3. A total of 1508 smokers (8.3%) were seen with any type of tobacco consumption. The frequency of ICU admission in the smokers is significantly higher than that in non-smokers (23.9% vs. 18.8%). A total of 668 (44.3%) smokers had more than 50% ground glass opacity in lungs, whereas 5340 non-smokers (32.1%) had so. Use of more than three medications in the smokers was significantly higher (70.6% vs. 52%). A comparison between patients based on smoking indicates that the death rate was significantly higher in smokers (31.6% vs. 25.6%). Conclusions: Although smoking rates in COVID-19 patients are lower than those in the general population, the consequences and mortality are higher in smokers.

Trend of Smuggled Cigarette Consumption in Tehran in the Last Two Decades.

BACKGROUND: Illicit tobacco trade is focused on Iran as a main target in the WHO's eastern Mediterranean region. Serial studies of Cigarette Packs Survey with same method were conducted in Tehran between 2003 and 2015 to evaluate consumed smuggled cigarettes. This study as the fourth Cigarette Packs Survey is designed to indicate the trends of illicit cigarette trade in Tehran in the last two decades. METHODS: A cross-sectional household study was carried out in early 2021 in Tehran on 3042 persons who smoked at least one daily cigarette for a year. The sampling method was like the sampling method used in three previous studies. Participants aged≥15 years were asked to reveal their current cigarette pack, which was either legal cigarettes (having governmental label); or illegal cigarettes (without governmental label). RESULTS: The subjects included 2536 males (83.4%) and the mean age was 39.9±12.1 years; 1854 subjects (60.9%) showed foreign cigarettes and 1188 (39.1%) showed domestic cigarettes; 2705 (88.9%) consumed legal cigarettes and 337 (11.1%) consumed illegal cigarettes. Consumption of illegal cigarettes by gender showed greater use of smuggled cigarettes in males (11.7%vs 8.1%). No significant differences were seen based on the marital and educational status in terms of illegal cigarettes prevalence. CONCLUSION: Compare with previous studies, the trend of consumption of illicit cigarettes was decreasing in past two decades. This could be due to new regulation on monitoring cigarette distribution and changing illegal brands to legal as joint production.

COVID-19 and smoking: More severity and death - An experience from Iran.

BACKGROUND: Few studies have shown that smokers are more likely than nonsmokers to contract COVID-19, while others report that smokers are underrepresented among those requiring hospital treatment for this illness. This study was designed and implemented for investigating the severity and outcome of COVID-19 based on underlying smoking status. MATERIALS AND METHODS: This was a case-control study that was implemented in Tehran and Ahvaz with all COVID-19 patients from February to July 2020. Patients were divided into two groups of COVID-19 positive (1044 cases) and negative (1231 controls) randomly based on entrance number. RESULTS: The frequency of smokers in the case group is significantly lower than the control group (15.4% vs. 28%). However, the number of days of hospitalization and the use of more than 3 medications in the group of smokers were significantly higher. A comparison between groups of case and control based on smoking indicates that the death rate was significantly higher in smokers with COVID-19. CONCLUSIONS: The results of this study showed that although the number of smokers in COVID-19 patients is significantly lower, smokers run an aggresive curse and have higher mortality.

Prevalence of smuggled and foreign cigarette use in Tehran, 2009.

BACKGROUND: Iran is one of two main target markets for tobacco smuggling in the WHO's Eastern Mediterranean Region. The Iranian government has a local tobacco monopoly but there is high demand for international brands. Informal reports show about 20% of cigarette consumption is smuggled brands. This pack survey study is the first in Iran to gather validated information on use of smuggled cigarettes. METHODS: A randomized cross-sectional household survey in Tehran in 2008-2009 of 1540 smokers aged 16-90 (83% men) was performed, including interviewer checking of cigarette packs. RESULTS: In all, 20.9% of cigarettes and 6.7% of domestic branded cigarettes were smuggled. A total of 60.1% of smokers preferred foreign cigarettes. There was no significant difference between consumption of illegal cigarettes by sex. (Fisher exact test p=0.61) Use of smuggled cigarettes was higher among younger smokers (p=0.01). CONCLUSIONS: Use of illegal cigarettes is high. Tobacco control laws outlawing their sale are not being enforced.

A decade after introducing MPOWER, trend analysis of implementation of the WHO FCTC in the Eastern Mediterranean Region.

BACKGROUND: Perfect implementation of the six priority policies advocated by the MPOWER package is the most important challenge for member states (MS) to reach tobacco control goals. METHODS: A validated checklist set according to the WHO Report on the Global Tobacco Epidemic was filled out five times based on biannual reports from 2011 to 2019 for 22 MS in the Eastern Mediterranean Region. It contained ten topics including smoking prevalence and seven elements of six MPOWER policies and compliances resulting with possible maximum score of 37. High score indicates better implementation. RESULTS: The total score for the region increased from 416 in 2011 to 509 in 2019. Six countries (27% of the region) had more than 75% of total score, whereas 11 countries were between 50% and 75% and five countries had <50% of total score in 2019. In all five reports, Iran was ranked first in the region even in 2019, when it witnessed a 2 point decrease. Iran held the first place alongside with Pakistan and Saudi Arabia with 32 points. The highest score in the indicators was related to the monitoring, reaching from 35 in 2011 to 59 in 2019. The lowest score increase in the indicators was related to the Smoke-free Policy compliance and the prevalence of consumption, reaching from 18 to 20 and 44-48, respectively, between 2011 and 2019. CONCLUSIONS: Although several remarkable achievements have been made regarding tobacco control goals, many policy implementation challenges remain and require urgent action by member states in the Eastern Mediterranean region.

Quantitative comparison of WHO tobacco control measures: lessons from the Eastern Mediterranean Region.

BACKGROUND: In 2008, the World Health Organization (WHO) introduced a package of measures including 6 main policies (MPOWER) to control tobacco use. AIMS: This study aimed to perform a quantitative analysis of MPOWER in the WHO regions. METHODS: This cross-sectional study collected information in summer 2018 using pages 136-149 of the 2017 MPOWER report and a validated check list with 10 criteria, with a possible maximum score of 37. The scores were summed and presented in descending order for the 6 WHO regions. RESULTS: The highest mean score was recorded by the European Region (26.41), followed by: South-East Asia Region (25), Western Pacific Region (24.88), Region of the Americas (22.05), Eastern Mediterranean Region (21.40) and African Region (17.40). There were significant differences (P < 0.05) in the means. CONCLUSIONS: Although many efforts have been made in the Eastern Mediterranean Region, many challenges to policy implementation and enforcement remain compared with other regions, and require urgent action by governments in the Region.

Levels and health risk assessments of particulate matters (PM2.5 and PM10) in indoor/outdoor air of waterpipe cafés in Tehran, Iran.

To determine the concentration of particulate matters (PM2.5 and PM10), 36 samples were collected from indoor/outdoor air of hookah cafés (HS), cigarette cafés (CS), both hookah and cigarette (HCS), and no-smoking building (NS) in Tehran City from December 2017 to March 2018. The mean ± SD of PM10 concentration in the indoor air of the cafés in terms of HS, CS, HCS, and NS sites has been 702.35, 220.20, 1156.60, and 60.12 µg/m3, while for PM2.5, the values have been 271.92, 111.80, 619.10, and 22.25 µg/m3, respectively. It was also found that the PM concentration inside the cafés was higher during weekend session (with a higher number of active smokers), than during the weekday sessions. Moreover, the PM levels in the indoor air of the cafés were considerably higher than those of the outdoors (p < 0.05). Based on path analysis, the number of "active smokers" had the highest influence on production of PM inside the cafés, followed by the tobacco type. Finally, the mean excess lifetime cancer risk (ELCR) for PM2.5 in the indoor air of cafés was observed in the range of 0.64 × 10-5-14.98 × 10-5. Also, the mean of hazard quotient (HQ) for PM2.5 and PM10 was calculated in range of 0.82-18.4 and 0.16-3.28, respectively, which corresponds to an unacceptably high risk for human health. The PM levels in the indoor air of smoking cafés in Tehran are significantly high, such that it can cause serious risks for the health of both the customers and personnel. Thus, it is necessary that suitable controlling strategies be adopted for this public health threat.

Lung health in the Eastern Mediterranean Region: the need to end designated smoking areas in public places (Editorial).

Tobacco use is a fatal habit that causes harm to almost all organs of the human body and kills up to half of its users. Studies have shown that tobacco contains a poisonous mix of more than 7000 chemicals that have major consequences, including heart attacks and strokes , and are considered major risk factors for many types of cancer (4) and the leading cause of lung cancer. Moreover, tobacco use dramatically affects the respiratory system, damaging its airways and alveoli, and leading to chronic obstructive lung diseases1 including emphysema and chronic bronchitis.

Role of Telemedicine in Pace of Consultation and Physicians' Satisfaction in Thoracic Surgery ICU.

BACKGROUND: Despite various applications of tele-ICU, there are still many questions about its costs and advantages in ICU. Some of its advantages are accelerating consultations and bringing physicians' satisfaction from tele-consultation outcomes. The aim of this study is to discuss these advantages. MATERIALS AND METHODS: Initially a telemedicine network was implemented and in the case of having no related specialist, the physicians used telemedicine network to perform specialized tele-consultation to thoracic surgery ICU patients. ICU patient's documents during a year before tele-consultation were studied and delay time in consultation was recorded and compared between the two phases. Finally, the physicians' satisfaction with tele-consultation was evaluated. RESULTS: Fifty-eight tele-consultations in various medical fields were carried out, of which 27 were neurology cases. From the time of receiving a consultation request to its performance, the mean time was 1.3 days in tele-consultation. Tele-consultations were given 2.5 times faster than face to face method. In evaluation of physicians' satisfaction, 82.75% of them were fully satisfied from tele-consultation, 12.06% were partly satisfied and 5.17% were not satisfied. CONCLUSION: Since the length of hospitalization in ICU is crucial due to heavy costs of treatment, high risk of contamination and limited beds, performing timely consultation is a key factor in reducing hospitalization period. Tele-consultation in thoracic surgery ICU not only accelerates patient care, but also results in higher physician satisfaction.

Estimating of Net Transition Probabilities in Triple Stages of Cigarette Consumption in Iranian Men.

BACKGROUND: The present study was designed to estimate the net transition probabilities in triple stages of cigarette consumption in Iranian men over 15 years old. MATERIALS AND METHODS: Data from the national surveillance of risk factors of non-communicable diseases in 2011 were entered in the present study. Data of 3130 Iranian men between the ages of 15 and 69 years old were included. Individuals were divided to three groups of current smoker, past smoker and nonsmoker based on cigarette consumption. Afterwards, net transition probability of different stages of cigarette consumption over a year was assessed. RESULTS: Net transition probability from nonsmoker to smoker was at its highest level until 30 years of age at 19.1 per 1000 men and then net transition reduces to reach zero per 1000 men at the age of 45 years old. However, net transition probability from smoker to nonsmoker was at a very low level until 45 years of age but, it increases afterwards to reach a plateau at the age of 64 years old. Net transition probability from smoker to nonsmoker is estimated to be 23.1 per 1000 men at the age of 69 years old. CONCLUSION: For the first time, the present study has estimated the transition probabilities in different stages of cigarette consumption in Iranian adults. Findings showed that risk of becoming a smoker in younger individuals is much higher than the risk in middle-aged and old population. However, tendency to quit smoking is increased after the age of 45 years old. Therefore, health policy makers should concentrate on younger age groups in their preventive strategies regarding control of tobacco consumption.