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No one has yet studied these issues for marijuana vaporizers as far as I know, but the way that they work is to produce an aerosol of ultrafine particles to carry the THC into users' lungs.  These particles are tiny droplets, as they are with e-cigarettes.  The particles themselves are dangerous.  Because there is no combustion, however, there will be fewer toxic chemicals than you get when burining the marijuana.
 
This situatiuon is similar to e-cigarettes, which produce an aerosol by heating the e-liquid.  Because they do not burn the tobacco the e-cigarette aerosol is less dangerous than cigarette smoke.  Also, because e-cigarettes do not smolder between puffs, there is less secondhand aerosol put into the air for bystanders to breathe.
 
But, at least for e-cigarettes, they still do pollute the air and bystanders absorb nicotine and other pollutants.  Surprisingly, the nicotine levels in nonsmoking bystanders around people using e-cigarettes is similar to that measured when they are breathing secondhand cigarette smoke.
 
In addition, the cardiovascular effects have very nonlinear dose-responses, with big effects at low doses, so even the low levels of expsoure that e-cigarettes deleiver to <em;users</em; affect blood vessel function as much as smoking a cigarette.&nbsp; The particles play an important role in these effects.

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