"The leading clinical expert on marijuana sifts through the myths about the drug to deliver an unbiased, comprehensive guide backed by scientific facts to give you the information you need to make informed decisions about marijuana. Marijuana, or weed, pot, grass, MJ, Mary Jane, reefer, cannabis, or hemp among dozens of other names, has a long, colorful history dating back more than 2,000 years as the one of the most sought-after, mood-altering substances...