not sure what thread you're talking about but these links below should just about cover medical effects and myths...if not google 'cannabis health effects' for more links...10's of 1,000's of em...


HEALTH #
Cannabis vs. Tobacco as Cancer Causing Agents
Cannabis vs. Tobacco smoke compositions
Mouth-Smoking Cannabis
MYTHS & URBAN LEGENDS #
Exposing Marijuana Myths
Marijuana Myths, by Paul Hager
The Truth About Marijuana
Three Things Marijuana Doesn't Do
Flyer : 10 Things Every Parent Should Know about Marijuana
Amotivational Syndrome
http://www.erowid.org/plants/cannabis/cannabis.shtml

http://www.straightdope.com/classics/a2_225.html

http://www.mpp.org/

http://www.mpp.org/common_q.html
health effects

http://www.norml.org/index.cfm?Group...m_format=print
Marijuana Health Mythology