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Much like free-base nicotine products, these liquids contain propylene glycol and/or vegetable glycerin, as well as other chemicals such as flavouring ingredients. Most vaping devices use electrical power from a battery to heat a liquid solution. The term "vaping" is also used to refer to the inhalation of cannabis aerosols, which are produced by products that differ from nicotine products described on this page. Propylene glycol and glycerin are the most common solvents used in vapor products. While generally recognized as safe for ingestion by the FDA, research has found both substances to be toxic when aerosolized through the vaping process.

In 2014, just under 8% of Wisconsin high school students were using e-cigarettes. In 2018, that number has skyrocketed to 20% (or one out of every five students[i]). They found that while several of the liquids were moderately toxic to the endothelial cells, the cinnamon- and menthol-flavored e-liquids significantly decreased the viability of the cells in culture even in the absence of nicotine. The tobacco cigarette used as a comparator was the Kentucky Reference Cigarette 1R6F (Centre for Tobacco Reference Products, University of Kentucky, USA), which has been designed to provide a standard test piece for scientific studies. It is an unflavoured US-blended king-sized product with a cellulose acetate filter, an aerosol nicotine level of 1.9 ± 0.1&nbsp