Potential modifiers of the relation between cotinine concentration and the number of cigarettes smoked in the last 24 hours included individual characteristics (sex, age, educational level, BMI), type of tobacco (use of regular or non-regular cigarettes [light, ultralight, mentholated, low nicotine yield], use of blond or black tobacco, and use of filter tips), and smoking behavior (frequency and depth of smoke inhalation)
The term water vapor may sound more innocent than the term smoke, as everyone knows that cigarette smoke carries tar, carbon monoxide and other lethal toxins
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