Are We Getting High on Marijuana?

Dr. Tom Deloe, Retired Health Researcher, Department of Health and Human Services talks to Dr. Christianson about Marijuana.  With the number of states approving medical or even recreational use of marijuana increasing, several questions arise. How extensive is the use among teens and what do we know about its effects?  What are the chances that teens or adults will move on to harder drugs? Has legalization reduced the prison population?  Has marijuana helped cure any diseases? If not, what are the positives and negatives of medical use?