An Australian study examined the chemical composition of tobacco, mint, and menthol e-cigarettes using gas chromatography-mass spectrometry, finding numerous sweet compounds in tobacco-flavored samples, and fruity and vanilla-like compounds in the menthol ones. According to the study’s results, flavors permitted by regulations often contain compounds that are indicative of otherwise prohibited sweet flavors.
Source: Europe PMC (pubmed.ncbi.nlm.nih.gov)