Smokers damage themselves and anyone beside them, while Alcohol drinker, in the act of drinking only damage his own body only.
Damage to anyone beside them is merely an opinion - not fact - an opinion from the same medical profession which one month tells us this or that is bad for you and a while later says "whoops sorry, we got it wrong; it's actually good for you"!
Some people will die from cancer, the same as others will die from a stroke or kidney failure etc., etc., because that is the way their body is made.
In the same way some people are short, fat, bald headed and ugly, while others (myself for instance) are tall, slim, with full flowing locks and have the face and body of an Adonis - it's just the luck of the draw.
However, it is fact that any evening (or day for that matter) you can be confronted with a stumbling, dribbling drunk who will curse and swear, vomit, fall down, frighten your family and get in his car and drive off.
In the emergency room of any hospital anywhere in the world you will see the effects of drinking. The place will be full of people bloodied and battered, the nurses verbally and physically abused and none of this caused by smoking.
Many women are physically and or sexually abused, and wives and families wait in fear for their man to come home; do you think it's because he may have been smoking or sitting near smokers?
My point is that it is ludicrous to ban an activity which may cause harm to others, while allowing an activity which definitely will.