What is the long term effect of marijuana use?

Long-term marijuana. One area is lung problems such as: bronchitis, chronic cough, emphysema, and also lung and upper airway cancer. There can also be impairment of memory, judgement, ability to learn, and coordination. These problems may persist for many months after stopping marijuana. Marijuana is a hallucinogen which can induce psychosis. Daily users may also have chronic depression, irritability, and lethargy.