None.
I'm 33 and I've never even been buzzed, I've drank alcohol a couple of times but never enough to feel anything. Last time I drank was 2003, had most of a glass of Guinness.
Never smoked a cigarette or anything.
The only time I've ever been "high" in my life was when the Navy prescribed me Vicodin after they ripped my wisdom teeth out (which didn't need to come out, but it's their policy if you're going on a submarine)