A friend who graduated from D.O. school suggested a normally healthy person might have 20 pack years before real damage would occur.
To me it’s like shooting yourself in the leg. No fun, only bad.
I always felt quickly worse from it, even at a pack a week level.
I suppose it’s relatively ok once in awhile at a casino while drunk, for the scene. Even then I’d prefer a cigar.
Cigarettes are just a real mystery to me. It seems to take an awful lot of money and work to beat yourself down with them for no payoff short term at all.