Starbird said:
It is actually an interesting question that - why do smokers get such a negative reaction (even when they are doing it behind closed doors) while moderate to heavy drinking is socially acceptable, if not outright encouraged in certain settings?
Alcohol has much, much deeper roots with human civilization. For thousands of years on at least three continents, beer and wine actually served and important role by providing a source of reliable potable liquid in areas/eras where water sanitation was either not understood or impossible. Many civilizations may not have been possible without alcohol.
Its psychoactive effects have long served important roles as well. It isn't called a "social lubricant" for nothing. And on the darker side, getting someone impaired under the pretext of socialization is a classic way of fighting dirty in business, diplomacy, and... personal matters. Combine this with the above, and you have something which socially could become almost as important as eating, if not sometimes more so.
Between having thousands of years to entrench itself in traditional and ritual meaning, and actually having major practical value for much of that time, alcohol is almost inseparable from most human cultures. Think about, say, the difference between wine and fruit juice. One is mass manufactured, and for the most part no one really gives much of a damn about brand or ingredients, and even when they do, it's always cheap and simple. The other has thousands of producers, ranging from cheap "ordinary" stuff to individual bottles that cost more than your car and are treated like culinary high art. Every ingredient, step, and flavor is fussed over. A wine or beer enthusiast can talk about a sip like an art history professor talks about a painting. This is the result of millennia of cultural evolution with necessity, vice, and socioeconomic class dynamics all intertwined.
Smoking tobacco on the other hand is fairly recent, and is purely a vice with little to no practical value. Its psychoactive effects are mild and don't have much social utility. It's only cultural value comes from superficial association with subjective aesthetic ideals like "coolness", so it's completely vulnerable to shifting trends.
Drinking in moderate amounts (like, say, one or two beers or glasses of wine a day) is not only fairly harmless intoxication-wise, but actually has long term health benefits, while smoking on the other hand is pretty much always just unhealthy; whether you smoke more or less is just a matter of how much you want to push your luck.
TL

R- Alcohol has an actual practical pro vs con dynamic, and has been with us much, much longer. Smoking is relatively new, and with no non-aesthetic pros always ultimately reduces to just a vice/weakness, even in moderation or in private.