Do you know how many people drink irreponsible everyday? More than you can count.. I think at this very moment, there is a child out there is being abused by her drunk father/mother. or how many people got DUI?
And yes, you can smoke responsible.. you go outside like many smokers do (or ventilated room) Smoking irresponsible is just as high as drinking irresponsible. Except I wonder how many people died of DUI, abuse from alcoholism, etc. than people who died of lung cancer and other lung disease.
But anyway.. I just see smoking and drinking in the same category, that's all. Except drinking does cloud your thoughts. Personally, I feel that if people really have a problem with smokers in a ventilated room or anywhere in general.. just banned the thing.