Keep Off The Grass, considered a classic, is written by one of the worlds’ most knowledgeable scientists on the subject.  It has been translated into Spanish, French, Dutch and Swedish.  In it Dr Nahas tells:

• exactly what marijuana is and just how addictive it is
• what its surrogates – hashish, cannabis and THC – are
• the history of marijuana and how its use eroded ancient civilizations
• what the Surgeon General’s warning says about marijuana – its damaging effects upon lungs, reproductive function, immunity system and the brain
• how marijuana differs from alcohol and tobacco
• why it is the “gateway drug” to heroin and cocaine

Author: Gabriel G Nahas
Publisher: Eriksson (1985)
ISBN: 0839743823