Cocaine, heroin, marijuana and ecstasy are the four major drugs in Michigan. Meth increased 91% from 2007-2008 Meth is very common in areas around Missaukee especially Cadillac Teens use lesser known drugs; Hallucinogens, Prescription Drugs, Tobacco, Marijuana and Alcohol Alcohol and weed are the most abused drugs in Michigan by teens Weed is illegal for anyone in Michigan, there is no age where it is legal