| Did you read the study? From the Reuters article: "Despite the widely held view that cannabis is benign, this research adds to previous work suggesting otherwise," said Ian Hamilton, a lecturer in mental health at Britain's York University. There are several “handwaving” maneuvers in the paper, best summarized by this quote from lead author (PhD candidate): "Yankey said were limitations in the way marijuana use was assessed -- including that researchers could not be sure whether people had used the drug continuously since they first tried it." A direct quote from the paper shows this: "Duration of marijuana use was estimated by subtracting participant’s age at marijuana use initiation from the age at the 2005 screen." Then the conclusion begins with: Marijuana use, especially prolonged years of use, may increase the risk of hypertension mortality… ------ Should be clear now. |