monkey smokes cigarette smoking Digital Art by Amir Faysal A drawing of a monkey

Melasma: Hormonal changes during pregnancy or while taking hormonal medications may trigger dark patches on the face and lips

"For our calculations, we assumed an adult who smokes one pack of cigarettes per day beginning at age 18, when a person can legally purchase tobacco products in the U.S

This real-world usage pattern also supports the 20-cigarette = 600-puff vape rule of thumb

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