| http://www.w3.org/ns/prov#value | - If you really wanted a control group you would need to find people who have no access to marijuana (good luck) AND make absolutely sure there are no contributing effects from cigarettes, alcohol, heroin, cocaine, PCP, meth, ecstasy or other substances, any of which the marijuana might also be using and all of which are already known to be more harmful than marijuana.
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