Have you people not done any research? Marijuana is NOT harmful! Even in pregnant women, marijuana does not harm the fetus in anyway (the study followed the children until age 6, and surprisingly the children of mothers who smoked pot while pregnant actually had higher test scores, were able to handle stress and social adjustments better and the list goes on and on..) While addiction to marijuana can happen (it's a mental addiction, not physical), addiction only occurs when the person wasn't stable to begin with and has an addictive personality in general. Smoking marijuana is not known to give lung cancer (like some other inhalants we know of). How can you say we don't know the long term effects?!
5,000 YEARS OF RECORDED USE, NOT ONE SINGLE DEATH FROM MARIJUANA OVERDOSE.