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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.
Marijuana affects the body in a variety of ways. Marijuana effects on the body include effects to the: 1. 1  Immune system. 2  Heart. 3  Lungs. 4  Reproductive system.