Many people feel the small (possible) reduction in average lifespan is worth the enjoyment or quality of life they get from those things.
Optimizing your life strictly around maximizing potential lifespan is certainly an option, but one that many people would feel is an unworthy tradeoff with what they'd have to give up.
---------
The difference with smoking vs the other things mentioned frequently in this thread (beyond likelihood of addiction), is that the reductions in lifespan with smoking are huge.
The average smoker loses at least a decade of their expected lifespan from what I can see.
Alcohol's effect on expected lifespan is more disputed, but even those claiming it's a negative in all quantities, generally make far smaller claims as to the degree of reduction for moderate/average use than are the case for smoking.
--------
Additionally, the average smoker doesn't appear to even be particularly fond of their activity. I do not meet many middle aged smokers that talk in any sort of particularly positive terms about their smoking or that seem to have positive memories associated with it.
Optimizing your life strictly around maximizing potential lifespan is certainly an option, but one that many people would feel is an unworthy tradeoff with what they'd have to give up.
---------
The difference with smoking vs the other things mentioned frequently in this thread (beyond likelihood of addiction), is that the reductions in lifespan with smoking are huge.
The average smoker loses at least a decade of their expected lifespan from what I can see.
Alcohol's effect on expected lifespan is more disputed, but even those claiming it's a negative in all quantities, generally make far smaller claims as to the degree of reduction for moderate/average use than are the case for smoking.
--------
Additionally, the average smoker doesn't appear to even be particularly fond of their activity. I do not meet many middle aged smokers that talk in any sort of particularly positive terms about their smoking or that seem to have positive memories associated with it.