do filters on cigarettes do anything Filters: a cigarette engineering hoax that harms both smokers and the environment Cigarette filter - Wikipedia

These tobacco by-products were detected in cervical mucus of women who smoke, thereby establishing that smoking causes cervical cancer

To measure smoking frequency, participants were asked: In the past 30 days, on the days that you smoked cigarettes, about how many cigarettes did you smoke per day?

One death was a murder, while the other was a fatal fall from a hotel balcony, and in both cases marijuana's causal role is debatable

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Note that manufacturers may inflate puff counts