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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 Marijuana Abuse. In addition to positive and negative intoxicating effects, marijuana abuse can also have negative effects on an individualâs physical and mental health, especially in someone who uses marijuana for a long period of time.