Marijuana’s impact varies depending on the part of the brain it’s acting on, researchers say Researchers examine effects of marijuana on brain London researchers are looking at why cannabis can have such different effects on different people. CTV’s Celine Moreau has more. Dr. Steven Laviolette of the Schulich School of Medicine and Dentistry discusses his research on marijuana’s impact on the brain in London, Ont. on Monday, July 8, 2019. (Celine Moreau / CTV London)

2019-07-08