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The cytotoxic and pro-inflammatory effects of different e-cigarette flavouring chemicals were also tested on two human monocytic cell lines—mono mac 6 (MM6) and U937 [86]. Also, all the tested flavours produced significant levels of ROS in a cell-free ROS production assay. Finally, diacetyl, pentanedione, O-vanillin, maltol, coumarin, and CAD induced significant IL-8 secretion from MM6 and U937 monocytes [86]. It should be borne in mind, however, that the concentrations assayed were in the supra-physiological range and it is likely that, once inhaled, these concentrations are not reached in the airway space.

Enrollees in the program receive interactive daily text messages tailored to their sign-up date or their target quit date if they set one. Program users who set a quit date (which they can change) receive messages for at least one week prior to the quit date and for at least two months following the quit date. Those brands have been sold in the U.S. for years, awaiting FDA action on their scientific applications. To stay on the market, companies must show that their e-cigarettes provide an overall health benefit for smokers, without significantly appealing to kids.

Among people who were currently using e‑cigarettes, the proportion of people who used them daily remained stable from 2016 (42%) to 2019 (42%), then increased in 2022–‍2023 (49%). While more males than females used e‑cigarettes daily, the change among females was much greater than among males, rising from 36% in 2019 to 51% in 2022–‍2023. This corresponds to a fourfold increase in the number of females using e‑cigarettes daily, from approximately 70,000 to 300,000 (Figure&nbsp