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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.
Physical Effects of Marijuana. Learn about the physical effects of marijuana use in this Howcast video. Marijuana has several different effects on the body. If youâre using it medically you should prepare yourself for some side effects. For some people these side effects are mild, but if you donât know that theyâre happening they can be a little frightening.