Dr. Arnold Tashkin of UCLA conducted the largest-ever study of marijuana's effect on the lungs. His team found that not only was marijuana not associated with lung cancer, but that it possibly even exerts a protective effect against it.
Cannabis availability is harm reduction by displacement.... Public health is augmented. Cannabis as a therapeutic is a non-issue and doesnt do justice to the argument.
Controlled availability (D'classification as per 'restricted substances regulations' ) removes identified impediments to best practice and credible health promotion. End of story.