Marijuana has been scientifically shown to open airways, and has a calming effect on people (which could aid people with bipolar, schizophrenia etc. etc.) smoking any plant has negative effects but taking marijuana in a vapor or through consumption is actually beneficial. Quick history lesson, smoking pot was used as a common medicinal practice and was only banned when foreigners used it for other reasons. Marijuana is a harmless and beneficial medicine and stress reliever. Enough with this phony "War on Drugs" LEGALIZE MARIJUANA.