While it is technically possible to get high off of second-hand marijuana smoke, the chances of that happening are unlikely at best.

That's because cannabis smoke doesn't contain very much THC - the chemical that produces the plant's characteristic high.

When you smoke a joint, roughly half of the THC is absorbed into your body.

That means the THC content in the smoke being exhaled has already been significantly reduced. 

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Calvin Hughes ~ Civilized.Life ~