It is now. Benson Hausman, MD, forwarded this study from BMJ Open Access concluding that cannabis use  in concert with tobacco and/or opiate use causes the cardiovascular system to age. This could be a boon to the Prohibitionists, generating headlines like “Pot Link to Heart Damage.”  Albert Stuart Reece and colleagues at the School of Psychiatry and Clinical Neurosciences at Western Australia University gathered data on 1163 patients at a Brisbane addiction clinic —only 11 of whom were “cannabis only” smokers. The authors unconfound many confounding factors by statistical analyses that leave your correspondent more confounded than ever.