Listen now (35 min) | Why do soldiers fight? Maybe it’s patriotism. Maybe it’s comradeship. Maybe it’s fear of their own side. Or maybe it’s the drugs. For as long as there have been people, there have been people trying to get high. It’s no different in warfare. Fighters have used drugs to make themselves bloodier, stronger, more able to go without sleep. Lukasz Kamienski, author of "Shooting Up: A Short History of Drugs and War," joins us.