Just recently here and where I used to live in Salt Lake City, they have done the same thing, ban smoking from bars and public restaraunts as well as public areas like parks where kids play.
As far as the drug subject, I have never touched the drugs side of the chart, (i.e. marijuana, cocain, etc.) but I do drink, at least I did before my wife got pregnant. It wasn't daily or weekly or even monthly, it was a special thing that happened rarely and was never planned, so I never got hooked and I only once got to the point that I don't remember the previous night.
I turned 21 in april and it is legal for me to buy alcohol but I haven't, I work too much and never have time to, hence the special occasion. When my wife got pregnant I told her not until she could again and since she's breast feeding it's been longer then the normal 9 months but I haven't ever had the urge to have a beer.
I tried a cigarrette once and I about vomited, never will again, I was brought up to shy away from drugs but from these experiences it's your body do with it what you will. I say that for the lesser of the drugs. I knew a few potheads in high school, they were ok kids, weren't the brightest in the class but they did good, there were a few though that always came in high and left halfway when it wore off. That I don't like. If you want to smoke pot, more power to you, but don't do it where it can affect others, on your personal time.
You want to drink? Just like others have said, do it in moderation and don't be an ass, you know how it affects you more than anyone, you know you're going to get angry and want to fight? You shouldn't be in the bar. These drugs (alcohol, cigarretts, and mary-jane) are only as bad as the people who use them. You do it every once in a while it's not a bad drug, you do it daily and to the point you're wasted/flying/whatever they're a bad thing and should be banned.
The others, cocain heroin meth, and whatever else, should disappear, I live in rock springs wy now and it's a cocain infested town, you can spot an addict from a mile away and it's disgusting. I don't like knowing my son sees them too which is why we're moving soon, but these should have the ban, no matter how much you moderate them they will get addicted and find a way around the rules and laws so it would be pointless to try.
That's just my opinion do with it what you will.
Edit - oh and by the way, I lost a grandma recently to the cancers caused from her smoking half her life, it might not affect you like alcohol or pot, but it'll kill you too.
I wasn't here.