It may have started with Reefer Madness in 1939, which created an initial scare about the dangers of cannabis use.
Skip ahead four decades to the slack-jawed ramblings of Cheech and Chong, followed by such films as Friday, Half Baked and Pineapple Express, and cannabis in motion pictures became a caricature of mislabeled stereotypes.
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Britt Chester ~ Westword.com ~