I think this is exciting news. Scientifically, there is a clear consensus that marijuana is far less harmful to human health than most illegal drugs. It is also less dangerous than legal, highly addictive substances like alcohol and tobacco. The health effects of marijuana, compared to other recreational substances, depend on frequency of use, potency, dosage, and the age of the user. For healthy adults, occasional moderate use is virtually, if not completely, harmless. Marijuana primarily makes people feel pleasant and mellow, whereas alcohol can lead some drinkers to cause trouble in bars, commit violence at home, or drive dangerously.