Cannabis is safer than alcohol because it does not kill people. Many studies published in recent years show that it effectively alleviates pain in dozens of medical conditions, including multiple sclerosis, and in some parts of the USA it has been licensed for medicinal use. Legalising cannabis would reduce the violent crime associated with drug dealing and would enable the drug to be regulated.
Zamberletti E et al. The endocannabinoid system and schizophrenia: integration of evidence. Curr Pharm Des 2012;18(32):4980-90.