Marijuana can introduce pathogens into the lungs and can trigger a relapse in cancer or HIV patients who are also substance abusers and are in treatment or in recovery. This ability greatly deteriorates under even small doses of marijuana. The ability to follow a moving object is greatly impaired by even small doses of marijuana. Marijuana has ability to suppress your inhibitions. Under the influence of marijuana, you're more willing to do things that normally you would be inhibited from doing.
Chronic bronchitis consists of chronic cough for most of the days in a few months out of the year.
Marijuana smoke also depresses the body's immune defenses against infection and probably increases the frequency of acute infectious respiratory illness. They begin to experience anxiety which then perpetuates or creates more anxiety than what they're feeling and eventually, they have an acute break. We deal with them at rock concerts as well as at the Clinic. This psychotic break causes them to be very paranoid, very upset, and very anxious. Those reactions are usually treatable and we can help a person calm down.