Enhanced episodes of "Drugs, Inc." provide a comprehensive look at society's most abused drugs: cocaine, methamphetamine, heroin and marijuana.

The business of crack cocaine takes its toll worldwide.

Boston students and dealers get ready for National Weed Day; enhanced episode.

In this enhanced episode, every other drug used in Thailand is overtaken by a candy-colored pill.

Vancouver's suburbs hide a drug trade, spawning a gang rivalry; enhanced episode.