Not only should medical marijuana be made available to patients in need, but adult recreational use should be regulated. Drug policies modelled after alcohol prohibition have given rise to a youth-oriented black market. Illegal drug dealers don't ID for age, but they do recruit minors immune to adult sentences. So much for protecting the children.
Throwing more money at the problem is no solution. Attempts to limit the supply of illegal drugs while demand remains constant only increase the profitability of drug trafficking. For addictive drugs like heroin, a spike in street prices leads desperate addicts to increase criminal activity to feed desperate habits. The drug war doesn't fight crime, it fuels crime.