It’s no secret that younger people are typically more in favor of changing our country’s failed marijuana laws than older people, but marijuana use among seniors is on the rise. According to surveys from the Substance Abuse and Mental Health Services Administration use among people 50 and older who report using marijuana in the prior year went up from 1.9 percent in 2002 to 2.9 percent in 2008. Marijuana use among 55- to 59-year-olds has more than tripled during that same time period (1.6 percent…