One Thai doctor is on a mission to prove that marijuana can cure cancer. Meanwhile for epilepsy and cancer patients who are already self-medicating, the legalization battle is a matter of survival.

Visit the weed-growing heartland of Laos - the home of the bong - and embed with underground illegal growers and innovative marijuana chefs in Bangkok.

An introduction to the history and current state of weed in Thailand and Southeast Asia. Takes a glance at how the Vietnamese war influenced the attitude to ganja in Thailand, and how they are bound together with Laos by the river Mekong.