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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.
Scientists have learned a great deal about how marijuana acts in the brain to produce its many effects. When someone smokes marijuana, THC rapidly passes from the lungs into the bloodstream, which carries the chemical to the brain and other organs throughout the body.ddictive potential. Long-term marijuana abuse can lead to addiction; that is, compulsive drug seeking and abuse despite its known harmful effects upon social functioning in the context of family, school, work, and recreational activities.