the early 1970s showed that marijuana, when smoked, lowered intraocular pressure in people with normal pressure and those with glaucoma. In an effort to determine whether marijuana, or drugs derived from marijuana, might be effective as a glaucoma treatment, the National Eye Institute supported research studies beginning in 1978. These studies demonstrated that some derivatives of marijuana transiently lowered lowered intraocular pressure when administered orally, intravenously, or by ...