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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.
While these and other effects seem harmless, they can take a toll on the body. 1  Increased heart rate. When someone uses marijuana, heart rateânormally 70 to 80 beats per minuteâmay increase by 20 to 50 beats per minute or, in some cases, even double. 2  Respiratory (lung and breathing) problems.