Understanding how cigarette smoke affects HVAC systems is the first step to protecting both your equipment and your indoor air quality
There are four parts to an e-liquid and all reputable UK manufacturers ensure that they only use the highest food and pharma grade constituents

coupons, multipack discounts) of vapor products (with some exceptions).9 Advertisements for electronic cigarettes and vapor products intended to be used for the consumption of nicotine are prohibited from display in store fronts, exterior windows and doors of stores within 1,500 feet of a school (in New York City, this provision applies to stores within 500 feet of a school).9 Local tobacco laws New York City: Prohibits the sale of all flavored e-cigarettes10 Prohibits the sale of flavored tobacco products with a characterizing flavor other than menthol, mint or wintergreen, except in certain tobacco bars10 Prohibits the use of all tobacco products at all ticketed sporting events, including at Citi Field and Yankee Stadium13 Requires that cigarettes and little cigars not be sold at retail for less than $13 per 20-pack, including sales tax14 Requires cigars that cost less than $3 individually be sold in packs of four or more13 Requires little cigars be sold in packs of 2015 Manheim prohibits the sale of all flavored tobacco products.10 Yonkers prohibits the sale of flavored e-cigarettes.10 Hempstead and Nassau County prohibit the sale of e-cigarettes within 1,000 feet of a school, playground or park

They claimed that some of it was made using forced labour, controlled by Chinese gangs
The most described references are the Vitrocell VC 10 Smoking Robot and the Borgwaldt RM20S Smoking machine
3.0.CO;2-A Robbins WA, Vine MF, Young Truong K, Everson RB (1997) Use of fluorescence in situ hybridization (FISH) to assess effects of smoking, caffeine, and alcohol on aneuploidy load in sperm of healthy men