No medical use?  There is none so blind as those who will not see.  Too bad you mind is so closed.  It is used for treating epileptic seizures for one.  http://www.nbcnews.com/health/health-news/cannabis-drug-reduces-seizures-severe-epilepsy-cases-n764381 This is just one of many conditions it is used to treat.  Sorry, the world is not going to conform to your misconceptions.