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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 have mostly been linked to THC, the active ingredient in Cannabis sativa. Dizziness is a common side effect. Marijuana may have effects on almost every organ system in the body, including the central nervous, heart, endocrine, and immune systems. Use cautiously with alcohol.