There are over 400,000 emergency room visits per year from marijuana.  THC has biphasic activity.  At low doses it can create the desired effects but at higher doses it has the opposite effects.  These effects include irritability and even psychosis.<p>[1]New England Journal of Medicine (2014): Adverse Health Effects of Marijuana Use:
<a href="http:&#x2F;&#x2F;dfaf.org&#x2F;assets&#x2F;docs&#x2F;Adverse%20health%20effects.pdf" rel="nofollow">http:&#x2F;&#x2F;dfaf.org&#x2F;assets&#x2F;docs&#x2F;Adverse%20health%20effects.pdf</a><p>[2]
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