go to the marijuana forum. it's just weed, jeez. Why the fuck dont you google it up and do some research yourself? If you're really 18, you'd have already thought of that... provided you have half a brain.
Just smoke it, and figure it out yourself. That's really the only way you'll truly find out. You're analyzing it all way too much. Plus, the answers to those questions are situational. The answer could differ as a result of the bud quality, how much is smoked, the setting you're in, etc..
You'll probably end up hooked on crack with the government taking your baby away from your box on the side of the road.....