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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 How can marijuana affect the baby? 2  Studies of marijuana in pregnancy are inconclusive, because many women who smoke marijuana also use tobacco and alcohol. 3  Smoking marijuana increases the levels of carbon monoxide and carbon dioxide in the blood, which reduces the oxygen supply to the baby. How can marijuana affect the baby? 2  Studies of marijuana in pregnancy are inconclusive, because many women who smoke marijuana also use tobacco and alcohol. 3  Smoking marijuana increases the levels of carbon monoxide and carbon dioxide in the blood, which reduces the oxygen supply to the baby.