Researchers at the International Centre for Science in Drug Policy spent the past year examining the best and current scientific evidence about marijuana to see which of the most common claims about pot stand up to scrutiny.
They've turned that work into Using Evidence to Talk About Cannabis, a new project that puts scientific evidence into plain language so people can understand, and act on, the truth.
"Over the past year we've been working diligently on scanning the news media and online conversations about cannabis to identify the most often repeated or high-profile claims related to its use and regulation," says Dr. Dan Werb, director of the ICSDP.
They took the list of claims and reviewed all relevant scientific research. Their findings were then peer reviewed.
In the end, Werb says, "we found that not one of the claims about cannabis that we identified were strongly supported by scientific evidence."
Here are six of the most common claims about marijuana use, and what the current scientific evidence says about them.