Do people who smoke mary jane really lose brain cells?

Brain function: The research is equivocal about actual brain cell loss with use of marijuana. (mri scans don't show this.) however, brain function definitely changes for the worse while under the influence -- and possibly longer, especially with chronic use. http://www.drugabuse.gov/publications/research-reports/marijuana-abuse/how-does-marijuana-use-affect-your-brain-body.