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Research has also shown flavor chemicals to be toxic in both e-liquid and aerosol form. While many flavor chemicals used in vaping products have been approved for ingestion, they have not yet been tested for safety when aerosolized. Flavor chemicals are typically not listed on e-cigarette packaging, and most e-liquids contain more than one flavor chemical. Benzaldehyde (used in cherry-flavored products) and 2, 5-dimethyprazine (used in chocolate-flavored products), specifically, may harm human health.

Originally, it was thought that vaping might be helpful for people trying to quit smoking. Some e-cigarette labels have claimed that the product had no nicotine when, in fact, it was in the vapor. For this reason, it’s important to use only trusted brands if you vape. E-cigarettes are still relatively new, so their long-term effects are unknown.

They observed, on average, a 34 percent reduction in the femoral artery’s dilation. These findings suggest that vaping can cause significant changes to the inner lining of blood vessels, said study lead author Alessandra Caporale, PhD, a post-doctoral researcher in the Laboratory for Structural, Physiologic, and Functional Imaging at Penn. In this study, the researchers examined the impact of an e-cigarette that contained propylene glycol and glycerol with tobacco flavoring, but no nicotine, which study participants took 16, three-second puffs from. To evaluate vascular reactivity, researchers constricted the vessels of the study participants’ thigh with a cuff and then measured how quickly the blood flowed after its release. Using a multi-parametric MRI procedure, researchers scanned the femoral artery and vein in the leg before and after each vaping episode to see how vascular function changed.

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