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] have been offset by the increasing consumption in low income countries, especially China. The Chinese market now consumes more cigarettes than all other low- and middle-income countries combined. Levels of naphthalene were slightly higher than those of pyrene in e-cigarette emissions, while the respective air blank was lower. Nevertheless, it seems likely that these compounds were detected in e-cigarette emissions due to their presence as low-level contaminants in the background air, rather than originating from the vaping product. E-cigarettes are devices that use an electric battery to heat up a liquid (commonly called an "e-liquid") into an aerosol, which the user inhales. Vitamin E acetate, diacetyl, formaldehyde, and acrolein are just a few among hundreds of potentially hazardous substances commonly found in e-liquids and their aerosols.

However, many young users report they began using e-cigarettes because of the flavors and, according to CDC, do not realize they are inhaling nicotine. E-cigarettes are relatively new, and their long-term effects are not yet known. Although they may potentially be less harmful substitutes for traditional cigarettes, risks of addiction, injury, and death from e-cigarettes are becoming more apparent. Wehrli noted that they observed these striking changes after the participants (all of whom never smoked previously) used an e-cigarette a single time.

Levels below the LOD or LOQ, or even below the threshold levels proposed by the AFNOR standard guidelines, provide evidence of the optimal operation conditions (e.g., adequate wick saturation without extreme coil heating) of the ceramic wick-based device. E-cigarettes are battery-powered devices designed to deliver nicotine and/or other substances including, in some cases, flavourings. Although e-cigarettes were first proposed in 1927 by Joseph Robinson1, it was only in the early 2000s that the 1st generation of e-cigarettes or ‘cig-a-likes’ became commercially available2,3,4. Subsequent generations of devices have evolved since then, ranging from e-cigarettes with prefilled or refillable cartridges (2nd generation) to rechargeable tank-style devices (3rd generation) with modifiable or ‘‘Mods’’ components3,4,5,6. The 4th generation of devices, known as ‘Pods’, has been driven by advances in electronic atomization technology3,7,8,9.

Although there’s no definitive answer at this point, experts do have a theory about how vaping harms lungs. Young people who vape may be more likely to become addicted than adults. Nicotine exposure during this vital time can affect brain development in subtle and important ways. Research published in 2017 found that the high temperatures needed to form the mist for vaping can create dozens of toxic chemicals, such as formaldehyde, which is thought to cause cancer.

Although PG and glycerol are the major components of e-liquids other components have been detected. Of note, the analysis identified formaldehyde, acetaldehyde and acrolein [4], 3 carbonyl compounds with known high toxicity [63,64,65,66,67]. While no information was given regarding formaldehyde and acetaldehyde concentrations, the authors calculated that one puff could result in an acrolein exposure of 0.003–0.015&nbsp