I think smoking weed is not too bad if you are able to control it and dont smoke it every day. Same with alcohol. No problem about drinking as long as you dont HAVE to do it because you got the feeling you cant live without it. Thats the point when you definitely have got a problem.
I would lie when I said I never smoked weed. I havent done it for some time now but I respect people who do it occasionally. And I bet most people have at least tried it out once or twice.