http://www.cannabis-med.org/science/...efinitions.htm
That answers one question.
As to the rest, in my line of work I have seen the effects of this drug and I know that it does have at least most of those side effects : fatigue, memory problems, decreased motor capabilities, slurred speech, dizzyness. And it seem obvious that you would have lung problems, I mean you are lighting something on fire and breathing it in, that is not good for your lungs. As to the long -term medical problems, I haven't seen them firsthand but I have seen the others so it seems logical to believe that it could have other negative effects.
You still don't know what your talking about. Your just going by ******** the govt. gives out to scare people into doing it. As I said, it's not the plant that harms the lungs it's the paper from blunts or joints. Yea, your lungs aren't intended to inhale smoke but marijuana is the least lethal smoke to inhale. Burning smoke from houses are poisonous, cigarette smoke is lethal because it's got rat poison in it or something, smoke from a grill is dangerous from the charcoal and can kill you. Marijuana smoke is just thick but doesn't exactly harm the lungs. Marijuana and lung cancer don't sync with eachother. But cigarette smoke and lung cancer does.
One other thing, think about which side would benefit more from lying to you. Cuz face it, they cant both be right, either its not harmful or it is.