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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.
Side Effects of Marijuana: Respiratory Issues. Medical Marijuana Side Effect: Respiratory Issues. Smoking marijuana releases tar, carbon monoxide and other chemicals, which may cause respiratory issues in medical marijuana patients. Also, smoking marijuana exacerbates problems for people who already have upper respiratory problems such as asthma, so people who already have lung problems are not advised to use marijuana by means of smoking it.