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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 the Body. Marijuana comes from the Cannabis plant. The flowers, seeds, leaves, and stems of the plant must be shredded and dried before they can be used. Most people who use marijuana smoke it, but it can be mixed into food, brewed into tea, or even used in a vaporizer.