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I quit smoking cigarettes in May of 2017 but began vaping then and continued to vape for 3 years after I quit smoking

If this is the case for you, by all means, use them both

"RJRV has adduced evidence that the FDA has effectively banned all non-tobacco-flavored e-cigarettes, pursuant to its new and secret heightened evidentiary standard," Jones writes, "without affording affected persons any notice or the opportunity for public comment." The question of whether that de facto ban qualifies as a "substantive rule" is "not a close call," the 5th Circuit says

The trial randomized 458 people who smoked daily and wanted to quit to receive either a nicotine-containing e-cigarette and placebo tablets, varenicline and an e-cigarette without nicotine, or a placebo tablet and a nicotine-free e-cigarette for 12 weeks