Marijuana: Cannabis Is Pleasurable Because it Changes Brain’s Reward Center on Cellular Level – Newsweek

Read article - Alan Budney, professor of psychiatry, is quoted in an article about new research that suggests that "long-term exposure" to the active compound in marijuana could affect the way brain cells are implicated in addiction. "We've known marijuana can lead to an addiction in some people, and we know that it happens because marijuana stimulates dopamine production and makes you feel good," says Budney. "In terms of demonstrating that it can be addictive, we're beyond that already."