It should be emphasized that the lack of evidence may be attributable to the paucity of research
And the decrease in citing indoor use lined up with the time frame over which a number of cities and states banned e-cig use indoors, they wrote
Supplementary Information The online version contains supplementary material available at 10.1186/s12889-025-25454-6
These cbNPs were further determined to consist mainly of carbon-based materials, low amounts of oxygen, and traces of potassium, chlorine, aluminum, and silica [74]
That was a problem
In China, lung cancer rates in those who had never smoked fell steadily over time, probably due to a large reduction in household air-pollution, whereas the smokers lung cancer rates rose and will continue to do so, resulting in greater relative risks now than in the past ( Lancet 2015