Marijuana is dangerous / U.S. Drug Enforcement Administration -- Marijuana is beneficial / Lester Grinspoon -- Marijuana is addictive / Joseph A. Califano, Jr. -- Marijuana is not addictive / Paul Armentano -- Marijuana has known medical benefits / The Economist -- Medical marijuana lacks scientific support / Peter J. Cohen -- Marijuana use is unhealthy / E.J. Sanna -- Marijuana can help ease chronic pain / Jana Christian -- Nonmedical marijuana use is extremely risky / Joseph A. Califano, Jr. -- The harmfulness of marijuana use is exaggerated / Maia Szalavitz -- Marijuana prohibition is harmful / Gary Cartwright -- Marijuana users need to be held accountable for their actions / Ross Clark -- Common sense is needed in marijuana policy / Cathy Young.