alcohol caffeine and tobacco are all classified as Brain Risk for Fighters Caffeinated Energy Drinks and Supplements:
Description
Potential OTC Regulation of ENDS The ENDS generally available today, such as e-cigarettes and personal vaporizers are marketed for recreational use (encouraging smokers to switch to vaping as a recreational alternative does not appear to be viewed by FDA as a cessation claim), and so are regulated by FDA as tobacco products

Here are the term comparison rates for the female: Unless a female uses e-cigarettes fewer than 24 times a year, it might make sense to go with a competitive carrier with tobacco rates
As the solution starts to thicken it will become much easier for the temperature to rise too high so be diligent
In the meantime I recommend checking out our Lung Experiment Tobacco post

Complicity exists at all levels, from the boards of directors to the employees