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1 Breathing problems. 2  Marijuana smoke irritates the lungs, and frequent marijuana smokers can have the same breathing problems that tobacco smokers have. 3  These problems include daily cough and phlegm, more frequent lung illness, and a higher risk of lung infections.
The Effects of Marijuana on Mental Health. Marijuana use can have a range of mental health effects on people. Although rare, sometimes it can produce anxiety and panic in a person after a single use. In high doses, marijuana can cause confusion, thought disorder and hallucinations.