Fact
E-cig users have reported symptoms pertaining to the lips, tongue, hard palate, and soft tissue.
Source 1:
Yang I, Sandeep S, Rodriguez J. The oral health impact of electronic cigarette use: a systematic review. Crit Rev Toxicol. 2020 Feb;50(2):97-127. doi: 10.1080/10408444.2020.1713726. Epub 2020 Feb 11. Erratum in: Crit Rev Toxicol. 2020 Apr 14;:1. PMID: 32043402.