Re: MAPS: THC and copper

[RickMAPS@xxxxxxx]

For more information about the effects of water pipes and vaporizers on
marijuana smoke, please check the article about a study funded by MAPS and
CANorml into this topic:

http://www.maps.org/news-letters/v06n3/06359mj1.html

and the companion article and marijuana and harm reduction
http://www.maps.org/news-letters/v06n3/06364mj2.html

In this study, water pipes did not help filter particulate matter.  More
accurately, the water did filter particulate matter but it also filtered just
as much or more of the cannabinoids, so the ratio of cannabinoids to
particulate matter  was not improved by the water pipes.  However, this study
did not test for combustion gases, which are likely to be filtered out by the
water in water pipes.

Vaporizers were shown to be helpful.

Rick Doblin

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