Marijuana use dampens brain’s response to reward over time, study finds
Most people would get a little ‘rush’ out of the idea that they’re about to win some money. In fact, if you could look into their brain at that very moment, you’d see activity in the part of the brain that responds to rewards. But for marijuana users, that rush just isn’t as big — and gets smaller over time, a new study finds. And that may open them up to more risk of addiction.