Researching and writing on marijuana is part of my job. I have been doing it for years. Most of my work revolves around medical cannabis, but research often spills over to the recreational side of things. And all these years I have been dealing with a nagging question: why do so many people want to use marijuana? I fully understand the medical side of things. I get the fact that a patient might walk into the Beehive Farmacy in Salt Lake City, UT to purchase medical cannabis as an option...