Smoking is bad for you. So is secondhand smoke, and our world would be much healthier without it.  You know this. And now thanks to a new Berkeley Lab study, we know that third-hand smoke is bad for you, too.

Hugo Destaillats, a chemist with the Indoor Environment Department of Berkeley Lab’s Environmental Energy Technologies Division, described it this way:

“The burning of tobacco releases nicotine in the form of a vapor that adsorbs strongly onto indoor surfaces, such as walls, floors, carpeting, drapes and furniture. Nicotine can persist on those materials for days, weeks and even months.”

And when it stays, it reacts with “ambient nitrous acids” to form things called TSNAs.

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