Addiction, a loss of control in behavior and thought, is very different than an organic desire for a product or service.
If you asked an addict if they want to have to consume a product everyday in increasing quantities, lest they convulse into a fit of pain, insomnia, sweat and uncontrollable bowel movements for a week straight, they'd say no.
Free will and choice do not factor in with this scenario and a laissez-faire attitude towards highly addictive drugs can be damaging.
People turn to hard drugs for a variety of reasons, a good percentage of them out of untreated mental illness or their situation in life. Addressing why people turn to them would eliminate a lot of demand that is not organic.