A new study published in Harm Reduction Journal by researchers at the University of California, Berkley, suggests that marijuana is a safe and effective substitute for alcohol and prescription drugs. In the study, 40 percent of marijuana users said they have used marijuana to control their alcohol addictions, 66 percent said they used marijuana instead of prescription drugs, and 26 percent said marijuana helped them stay off other illegal drugs. According to lead researcher Amanda Reiman: “Substituting…