Like with any drug or substance, you should always UNDER dose and slowly increase in small increments until you figure out your limits. I'm so glad I was pretty mature when i started smoking. It's like if it's your first time going drinking, and you try to keep up with your alcoholic dad who has drank every night for years.... you're gonna get sick as fuck. Take one hit, wait a little, see how u feel, take another one, etc... The first time you try weed (or anything) it shouldn't be about getting wrecked, it should be about learning as much as you can about this new experience. (feeling sick and out of control is no fun)