Although scientific studies indicate that marijuana is associated with profound mental illnesses, emotional problems, and physical diseases, a shocking number of Americans believe that weed is harmless or helpful — possibly even a natural cure for cancer.
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Are There Risks From Secondhand Marijuana Smoke? Early Science Says Yes→
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He started thinking: San Franciscans would never tolerate those levels of cigarette smoke in a public place anymore. So why were they OK with smoke from burning pot? Did people just assume that cannabis smoke isn't harmful the way tobacco smoke is?
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