You are not getting high from standing next to someone smoking. Psychoactive elements of the drug occur when THC has entered the bloodstream. Second hand smoke does not contain THC.
Also, for anyone who is not educated about medical marijuana, it fully possible and in practice for medications with THC components to be controlled in such a way as the chemical reaction does not pass the blood / brain barrier.
In simpler terms, a child with a behavior disorder can be calmed down by the effects of a pill containing THC without experiencing any of the psychoactive side effects that smoking causes. So you get all the benefit and none of the "drug".
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