“A 2020 meta-analysis of 26 randomized controlled trials concluded “there is moderate-certainty evidence that [e-cigarettes] with nicotine increase quit rates compared to [e-cigarettes] without nicotine and compared to nicotine replacement therapy.” The results of population studies, Balfour et al. say, “are consistent with a near doubling of quit attempt success, found in the randomized controlled trials, and the fact that e-cigarettes are smokers’ most used aid in quit attempts.” They also note that declines in U.S. cigarette sales accelerated sharply as sales of vaping products took off, which reinforces the impression that more vaping means less smoking.”