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You do not need to clean them

Buyers visited the study websites and attempted to purchase the cheapest available disposable nicotine e-cigarette or, if unavailable, the cheapest nicotine e-cigarette starter kit, the researchers write

Among the 858 who completed a 12 month follow-up survey (66.8% of the original 1,284), 374 or 43% had made at least one attempt to stop smoking completely

Those two flickered in the wind but did not go out

The cigarettes in each pair were prepared with either traditional OML, or split-tipping (10-mm split gap) in combination with OML ventilation to achieve target tar yields, but otherwise had essentially identical composition (Additional file1: Table S1)