really the only bad things that come with smoking would be damages lungs, a tad bit of lazyness and the munchies. I'll admit i gained 10 pounds in a month when i started smoking.
Just because you smoke once doesnt mean you HAVE to become an everyday smoker or anything. If your curious about it and YOU want to try it than go for it with some buddies in a safe place. If you think its fun and wanna keep doing it go for it, if you think its alright but not worth the money or whatever than dont smoke. Don't let yourself be forced by your friends to smoke, make sure if you smoke your doing it because you want to.
If there is a God I'm sure it wouldn't mind you inhaling some burnt plant fumes.