Beau Kilmer, Eric Sterling, Robert DuPont, and Nora Volkow discuss cannabis legalization on the Diane Rehm show. Volkow’s presentation is a masterpiece of jumping to conclusions. She assumes that the net effects of cannabis legalization are negative, without even mentioning the costs of prohibition (arrest can be hazardous to your health) or the possibility that cannabis might substitute for alcohol. DuPont jumps from the correct obsevation that alcohol use and cannabis use are positively correlated across individuals to the unjustified conclusion that they are complements. Kilmer is much more judicious.