[user104658]

To be fair I largely agree that adults can do what they want with their lungs so long as they're fully informed of the risks, and it doesn't affect others. I smoked (socially, not habitually) through my late teens and Uni, so I'd say about 15 (estimated based on buying a pack of 20 and usually giving a few away) a week for 7 years, which I guess is a fair number of cigarettes. I also wouldn't say I regret it. I enjoyed that period of my life for what it was and got it out of my system .