Thomas Edward Radecki, MD, JD, Research Director of Doctors & Lawyers for a Drug Free Youth, stated on his website (accessed Mar. 9, 2006):

“Depression is a common side-effect of smoking marijuana. The evidence of a cause-effect relationship is very solid….

I have seen dozens and dozens of patients who have become seriously mentally ill thanks to the brain damage caused by marijuana. It is a major cause of depression and schizophrenia in our society as well as a factor in preventing our psychiatric treatments from working effectively.

It changes the personality, damages the memory, seriously impairs school performance, and causes auto crashes and death for far too many individuals.”

Mar. 9, 2006