Clearing the Haze – Is Marijuana Addictive?

In the past few years, as addiction researchers have been mapping out the chemical alterations in the brain caused by alcohol, nicotine, methamphetamine, and other drugs, America’s most popular illegal drug has remained largely a scientific mystery. It is a drug that millions of Americans have been using regularly for years, and, from a clinical perspective, it remains the least studied illicit drug of all.