tobacco contains how many chemicals Smoke Cigarette smoke components and their

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The full surveys in all three languages for ITC KRA1 Survey can be found at The survey protocols and all materials, including the survey questionnaire, received ethical approval from the Office of Research Ethics, University of Waterloo, Canada (ORE# 41512) and the Institutional Review Board of Korea Health Promotion Institute (#120160811107AN01-2004-HR-042-02)

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The investigators measured how the smokers smoked each of the products, the exhalation of carbon monoxide and their craving and withdrawal symptoms