Yes. Like alcohol and other drugs, not everyone who smokes marijuana gets addicted. But, some people do.

In 1995, 165,000 people going into drug treatment programs used marijuana as their primary drug. People who smoke a lot of weed sometimes develop a tolerance, meaning they need more and more to get high.

Some heavy users go through withdrawal if they stop smoking. That can include restlessness, loss of appetite, trouble sleeping, weight loss and shaky hands.

Marijuana sends more teens into treatment than any other drug. The only way to prevent becoming addicted to weed is to stay away from it completely.