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In this line, the maximum concentration tested (1000 M) would correspond to approximately 80 to 150 ppm, which is far higher than the levels found in aerosols of some of these compounds [84]

PMID 7628894

doi: 10.1136/tobaccocontrol-2016-053547 [DOI] [PMC free article] [PubMed] [Google Scholar] 20.Pollay RW, Dewhirst T

The gap widens rather than closes

Theyre at the low end of the interception scale and above the limit of diffusion

Moreover, using two NRTs together (known as combination NRT), such as the patch and gum or the patch and lozenges, is more likely to help you quit successfully than using just one, according to the CDC