The thing about the war on drugs is it tries to deal with a health problem as if it was a legal problem. Addiction is an effect of human unhappiness and human suffering. When people are distressed, they want to sooth their distress. When people are in pain, they want to soothe their pain.  So the real question is not “why the addiction?” But “why the pain? – Dr Gabor Mate

The Rat Park – Early 70’s experiment by Canadian psychologist Bruce K. Alexander to determine if drug addiction is influenced by our environment and subsequent level of happiness therein.