“There is not an adequate base of research that shows marijuana, in its most common form (smoked), is effective for treating any serious medical condition.

Therefore, no major group of medical experts supports the use of smoked marijuana for treatment of health problems…

We do not have enough information to reliably estimate the safety of marijuana when used long term. Most studies to date have followed patients for very short periods of time, often less than a week. This is not adequate to assess risk of use for indefinite periods of time. We do know that marijuana can contribute to short- and possibly long-term brain impairment, motor vehicle accidents, risk of addiction and an increased risk of long-term psychosis in vulnerable people.”