Dr. Lynn Ponton, a professor of psychiatry at the University of California at San Francisco, offers a medical perspective in this excerpt from a guest column published by the San Francisco Chronicle. “It’s my medicine, Doc,” said 18-year-old Jonathan, when I asked him why he was smoking marijuana every day. Surprised that any physician would prescribe marijuana for the anxious, depressed and disorganized adolescent sitting in my psychiatric office, I asked him where he had obtained the prescription. “A doc just like you. I heard about her from a friend. Anyone over 18 can get [...]