Umm I'm just kindof going to jump in here and reply to this at the same time.
I kindof have a problem with underage sex. People in relationships aren't really prepared for offspring. Enough said I hope.
The other two I mostly approve of, but they can totally go south... I know from experience with drinking and I've seen enough lazy potheads to know the other one.
Anyway, I smoke a decent amount and dude, there is no way he's a better driver when he's high. I'm sure he's nicer, but unless his driving is severely inhibited by constant road-rage, there's no way. Your reaction times go way down, thats the main way to spot high people; if they're decently high they respond slowly, meet eyes slowly, talk slowly. You may be better at video games, but that may just be a perception.
I agree that people get nicer, but theres no way someone gets better at driving (unless they usually drive at 120 like a raging asshole).
Marijuana is addictive. Its not very addictive and its also not physically addictive (its psychologically addictive, like video games, but stronger).
I hope it becomes legal and I sure hope it doesn't damage the human brain, but there are plenty of scientists out there who believe that it does.