A study on addictive behaviors published by USC and SUNY Albany in 2005, whose 4,400 participants made it the largest investigation of marijuana and depression to date, found that those who consume marijuana occasionally or even daily have lower levels of depressive symptoms than those who have never tried marijuana. The study added that weekly users had less depressed mood, more positive affect, and fewer somatic complaints than non-users. Glass water pipes, or bongs, are displayed at the HempCon in Orange County, California.
