I think the issue is that when one drinks, one theoretically only does harm to oneself (unless of course he gets behind the wheel of a car or smacks someone, which would really involve a whole other thread).
When one smokes, one imposes his deadly addiction/habit/etc. upon the health of others, including but not limited to second-hand smoke and the shortening of the smoker's lifespan, which in turn affects more individuals than just the smoker himself.
There are many arguments related to both sides, but I'm speaking generally here.
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