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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.
1 The harmful effects of marijuana on the Brain and Central Nervous System are: 2  Impaired thinking, mood, memory, and coordination. 3  Marijuana (THC) is an extremely powerful and pleasurable intoxicant.