[varyouga]

“That's simply not true. Harvard did studies that showed long term pot used damaged the same area of the brain as is damaged in schitzophrenic/bipolar subjects.”

Show me this study. I've gone through every existing research paper on this topic for the last 20 years and not a single one can show conclusive brain damage. There was one “brain scan” study but the technology was proven inaccurate.

The studies showing “linkage” show no greater link than can also be “proven” with tobacco.

Read the post I linked to. It shows schizophrenia rates have not increased even as cannabis use has increased exponentially around the world since 1970.

Evidence of Cannabis use has been found and dated to 2000-3000BC. There has never been a single person with bodily damage from cannabis. Research animals have been given constant doses exceeding anything a human can ever consume with no resulting damage.

[wideawake]

There has never been a single person with bodily damage from cannabis.

So it's magic smoke then? That leaves no trace on the lungs?

[DannyTN]

"It shows schizophrenia rates have not increased even as cannabis use has increased exponentially around the world since 1970."

I don't know what you are looking at but this researcher shows a huge increase in bipolar disorder.

"According to the 1969 book, Manic Depressive Illness by George Winokur of Washington University, Bipolar Disorder used to be fairly rare. In 1955, only one person in every 13,000 was hospitalized for it. Today, by contrast, according to the National Institute of Mental Health, Bipolar Disorder affects an astounding one in every forty adults in our country!!! "

Source

[DannyTN]

"Show me this study"

Harvard University Reports on Understanding Risks to the Brain from Marijuana

This article by drugfree california has a whole list of research studies.