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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.
Report Abuse. Marijuana is harmful in general. Yes it does effect your workout. Its hard on your body when you smoke because your body is already trying to get rid of the harmful things that your friend is smoking into it; while trying to 'work out' at the same time.