I have never smoked and drink very little, but I think I'm more worried about the mixed messages children receive about alcohol than about them seeing people smoking in public. After all, no one would ever tell a child that smoking is a good thing (would they?) whereas every day they see that alcohol is socially acceptable, pleasurable, a reward after a hard day (ooh I needed that glass of wine), something that families do together, that all generations enjoy.....
And every day people die of alcohol related diseases.
We are extremely hypocritical about our personal choice of drug. And before anyone says that alcohol is harmless as long as it is used sensibly, I have heard the same argument used about illegal drugs, and I know of quite a few people who use illegal drugs and continue to function, some of them in high ranking professional careers.