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"Hallelujah and glory be to Smoke Signals, Martin Lee’s bodacious new book, which...chronicles everything and everyone worth chronicling in the annals of marijuana—from George Washington, who grew it; to Drug Czar Harry Anslinger, who aimed to kill it; to Barack Obama, who enjoyed getting high on it as a teen."

A teen who consumes alcohol is likely to have reduced brain tissue health, but a teen who uses marijuana is not, according to a new study. Researchers scanned the brains of 92 adolescents, ages 16 to 20, before and after an 18-month period.

Despite the growing investigation on cannabis medicine for a wide variety of conditions, the actual healing power of the plant has barely been tapped. Learn more about the potential implications of cannabinoids for Alzheimer's disease, neurodegeneration, and more.

With the voters in Washington and Colorado legalizing marijuana, Martin A. Lee argues that the war on pot may be over — and good riddance to decades of bad science, scare-mongering, and harsh laws.