claim: "despite decades of marijuana being used for smoking in the united states, there have been no reported medical cases of lung cancer" attributed to marijuana.
author: john morgan
evidence_1: "despite decades of marijuana being used for smoking in the united states, there  have been no reported medical cases of lung cancer" attributed to marijuana.
evidence_2: "despite decades of marijuana being used for smoking in the united states, there  have been no reported medical cases of lung cancer" attributed to marijuana.
evidence_3: jul 6, 2017 ... medical marijuana advocate john morgan says cannabis smoking doesn't “ impair ... to back up his lung health claim, and added that “despite decades of  marijuana being … smok(ed) in the united states, there have been no reported  medical cases of lung cancer or emphysema attributed to marijuana.”.
evidence_4: although multiple studies have reported detrimental effects, others have not, and  the ... here we review the current state of the science related to the adverse  health .... heavy marijuana use has been linked to lower income, greater need for  ... the effects of long-term marijuana smoking on the risk of lung cancer are  unclear.
evidence_5: jul 6, 2017 ... the author of the medical marijuana amendment says the state law implementing  the amendment is ... "despite decades of marijuana being used for smoking in  the united states, there have been no reported medical cases of lung cancer or  emphysema attributed to marijuana," the lawsuit said.