Ten states and Washington, D.C., have legalized the recreational use of marijuana. Twenty-two other states, along with U.S. territories Puerto Rico and Guam, allow marijuana to be used for medical purposes. Let's examine some hidden issues about marijuana use. Before we start, permit me to state my values about medical or recreational use of any drug. We each own ourselves. If we choose to take chances with substances that can ruin our health, lead to death and otherwise destroy our own lives, that's our right. But we do not have a right to harm others in the process of harming ourselves.