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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.
4. Brain. Short-term marijuana use has no serious impact on the brain. Long-term use, on the other hand, has been linked to impaired thinking, memory problems, and psychological issues including anxiety. The effects of alcohol consumption on the brain are almost too many to mention.