prof. brandt: i am not an thisate for prohibition at point. something that comes up is what about black markets. black markets can also be addressed. i hear my economist friends say they don't like talking about the tobacco problem because of the black market problem. addressed thehas that ared consequences .hen addressed by policy i think strategically we should look at reducing tobacco use. >> [indiscernible] you have to go down the road of debating the legalization of other addictive substances. hand, there is a liberal political argument about decriminalizing other addictive substances because of the social conflicts and social injustice that the realization of it causes. we all very familiar with that. if he ended up with tobacco as the only addictive substance that was virtually prohibited, then you have a level of inconsistency in your argument. dt: i think they are very complicated arguments about bands. s. ban everything is on the table. what we really need to be doing is thinking strategically about how to reduce harms to peoples. th