It does have scientifically proven positive effects for medical uses.
Cancer, MS, glaucoma, chronic pain, AIDS, epilepsy, arthritis and other conditions are made better and/or more bearable by marijuana.
medical marijuana discussion site 10 states in the U.S. have medical use provisions.
National Organization for Reform of Marijuana Laws
And as a result of unfair sentencing laws, Judges who would choose to
give shorter sentences to productive citizens, are not allowed to make
this choice to to mandatory minimum sentence laws. This does more damage to society than help, as it removes hard-working people from the job market, and often forces thier dependant families to become dependant on government help programs, where as they were contributing to the economy as citizens. Families Against Mandatory Minimums
Willie Nelson claims that Pot saved his life. He used to smoke a pack
of cigarettes or more every day and drink whiskey, but gave these up
when he discovered marijuana. He claims he would not be here today if
he had continued in his previous habits.
Bird Food often contains hemp seeds as this encourages singing.
Jack Herer's book The Emperor Wears No Clothes has been a cult
classic for over 30 years.
http://www.onlinepot.org/grow/jackherer.htm