Look at your references. That's five years old. This was on that site.

"September 21, 2000 update: MAPS and CA-NORML are sponsoring a new vaporizer study. Testing and data analysis have been completed. A detailed report will be issued soon. "

The site I posted is the detailed report.
beachguy in thongs Reviewed by beachguy in thongs on . smoking from a pipe destroys 50% of the THC? i read here http://www.onlinepot.org/medical/vaporizer.htm that smoking weed from a pipe destroys half the THC. i dunno if its true, but they have instructions on how to make a vaporizor, which saves 45 percent of the THC. so if someone tries this out, tell me how well it worked. Rating: 5