what is the health risk in cigarette smoke Smoking Facts and Statistics Smoking and Your Heart -
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4) Is secondhand smoke dangerous

Smoking impacts hormones such as estrogen, progesterone, prolactin, thyroid hormones, and gonadotropins, which can lead to issues like irregular periods, reduced fertility, and early onset menopause (Pivot)

2016;10:CD005231

Source: University of Michigan

Creating Negative Air Pressure Negative air pressure means the area inside a room has lower pressure than outside