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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.
What are the Effects of Marijuana on a Fetus? Marijuana has many effects on the developing fetus. First, carbon monoxide in the motherâs blood travels across the placenta, lowering the amount of oxygen in the babyâs blood. This results in low birth weight. Marijuana can also damage the developing fetusâ brain, lungs and kidneys.