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[Week 1]– [Week 2]– [Week 3]– [Week 4]– [Week 5]– [Week 6]– [Week 6.5]– [Week 8]– [Week 10]– [Week 12]–

[week 13]– [Week 14]– [Week 15]– [Week 15.5]– [Week 16]– [Week 18]– [Week 19] [Week 20]– [Week 21]

Fact: None of the medical tests currently used to detect brain damage in humans have found harm from marijuana, even from long term high-dose use. An early study reported brain damage in rhesus monkeys after six months exposure to high concentrations of marijuana smoke. In a recent, more carefully conducted study, researchers found no evidence of brain abnormality in monkeys that were forced to inhale the equivalent of four to five marijuana cigarettes every day for a year. The claim that marijuana kills brain cells is based on a speculative report dating back a quarter of a century that has never been supported by any scientific study.