zvei dinim,
No one can be 100% sure of anything (I’m 99% sure of that). I am saying that he doesn’t expect to be unable to resist, of course he cannot be absolutely certain.
GAW,
The study cite is discussing temporary reactions (and theorizing that if one smokes often the damage won’t just be temporary). We do many things that temporarily damage our bodies in some fashion but we gain enjoyment or utility from it and we expect to recover. We play sports, lift weights, we pinch ourselves to stay awake, we eat processed and fatty meats, we pick scabs, etc.
Truthsharer,
Smoking one cigarette (or even smoking a couple of times a year), does not do any significant or lasting harm to the body.
PBT,
I have never seen this statement by Rav Asher Weiss but my guess is that he is referring to smoking regularly, not smoking once a year.