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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.
Effects Of Smoking Marijuana On The Human Brain: Drug Reduces Blood Flow To Hippocampus, Increasing Alzheimer's Disease Risk. Numerous studies tout marijuana for its brain protective benefits, from helping brain cells grow to shielding the brain from chronic stress.