Cannabis use linked to brain changes in emotion and motivation

Smoking cannabis alters the size and shape of two key brain regions involved in emotion and motivation, research has shown.

Even light use of the drug once or twice a week warped the brains of young adults, US scientists found.

Hans Breiter, one of the researchers from Northwestern University in Chicago, said: “This study raises a strong challenge to the idea that casual marijuana use isn’t associated with bad consequences.”