Does anyone know what the "Social Cost" of Marijuana use is? Is it as high as Alcohol?
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It is nowhere near as high.
There is no record in the annals of medical science of anyone dying or being made sick from using (clean, uncontaminated) marijuana. But alcohol is extremely pathogenic, killing hundreds of thousand of Americans annually in addition to causing many thousands more serious physical and mental illnesses.
Marijuana is not associated with violence at any level. But alcohol is known to cause most violent crime in America, from millions of simple domestic abuse complaints to many thousands of homicides, aggravated assaults and suicides.