Claim: "Marijuana contains 50 to 70 percent more carcinogenic hydrocarbons than tobacco."
Fact-check: R.I. psychotherapist says marijuana contains 50 to 70 percent more cancer-causing chemicals than tobacco
Verdict: barely-true
Organisation: PolitiFact
Author: C. Eugene Emery Jr.
Date published: 2014-03-06T00:00:00