https://thenextweb.com/opinion/2018/07/28/researchers-published-a-cannabis-study-thats-dangerously-misleading/

A recent study published by a team of researchers from Lancaster University and The University of Lisbon indicates long-term cannabis use could result in damage to the human brain. We’re not sure how they managed to come to that conclusion however, because the study was conducted using neither cannabis nor humans.

While the study was widely reported, with news sites in several languages declaring that scientists had potentially determined the harmful side effects of habitual cannabis use, it was science news site Inverse that pointed out the problem. The researchers didn’t use cannabis.