This can cause quite a few problems.
Tobacco smoke contains carbon monoxide, this combines with haemoglobin in red blood cells, meaning the blood carries less oxygen. In pregnant women, this can deprive the foetus of oxygen, the baby will then be born underweight.
The smoke also contains carcinogens, like tar. 90% of lung cancers are associated with smoking, including passive smoking.
Smoking tobacco is also addictive because of the drug nicotine.
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