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Smoking can cause lung cancer, cardiovascular diseases, high blood pressure, ...
There are many health-related reasons to give up cigarettes - not just for smokers, but to protect those around you. Babies born to mothers who smoke during pregnancy are twice as likely to be born prematurely and with a low birth weight.
Stopping smoking is the single biggest thing you can do to improve your health, although it' s a difficult task, you should try.