"Our results suggest that in the sample period about 32,400…

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https://www.nber.org/papers/w26589
"Our results suggest that in the sample period about 32,400 additional adult smokers would have quit smoking in Minnesota in the absence of the e-cigarette tax.

If this tax were imposed on a national level about 1.8 million smokers would be deterred from quitting in a ten year period."