Once, during Prohibition, I was forced to live for days on nothing but food and water.
Liquor prohibition led to the rise of organized crime in America, and drug prohibition has led to the rise of the gang problems we have now.
Prohibition has made nothing but trouble.
Even if one takes every reefer madness allegation of the prohibitionists at face value, marijuana prohibition has done far more harm to far more people than marijuana ever could.
For every prohibition you create you also create an underground.
Drug prohibition has caused gang warfare and other violent crimes by raising the prices of drugs so much that vicious criminals enter the market to make astronomical profits, and addicts rob and steal to get money to pay the inflated prices for their drugs.