how many carcinogens are in tobacco smoke Smokeless and cigarette smoking: chemical mechanisms and cancer prevention Tobacco smoke carcinogens, DNA damage

Slide the barrel back on, and adjust the airflow by spinning the barrel for your preferred level of drag

Use of Mentholated Cigarettes and Likelihood of Smoking Cessation in the United States: A Meta-Analysis, Nicotine & Tobacco Research While this meta-analysis did not find a significant association between use of menthol cigarettes and cessation overall, they did find that African-Americans who smoked menthol cigarettes were about 12% less likely to quit smoking compared to African-Americans who smoked non-menthol cigarettes

from Luciano Ruggia Image 1: Even sites selling disposable electronic cigarettes recently put forth the "95% myth" to promote their product

The few who do are already smokers in most cases

It's not listed anywhere as an option so it seems random