[ News >Yale Medicine 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. When studying tobacco cigarettes, researchers rely on smoking machines that simulate how frequently a typical smoker takes a puff and how much smoke is inhaled with each breath. No one has yet determined how much e-cig vapor the typical user breathes in, so different studies assume different amounts of vapor as their standard, making it difficult to compare their results. Tracing what happens to that vapor once it is inhaled is equally problematic. Researchers in a 2018 study found that cinnamaldehyde (found in cinnamon), o-vanillin (found in vanilla), and pentanedione (found in honey) all had toxic effects on cells. Studies suggest that nicotine-free vaping can irritate the respiratory system, cause cell death, trigger inflammation, and harm blood vessels. The e-liquid comes in a Juul pod or J-pod cartridge, which usually contains nicotine. This means that e-cigarettes cannot be used in areas where smoking is banned. Patients affected by the disease have symptoms ranging from cough, chest pain, and shortness of breath to fatigue, vomiting, diarrhea, weight loss, and fever. Since the initial outbreak, federal and state officials have reported thousands of cases and dozens of deaths related to EVALI. Ventilation, filtration and air cleaning techniques may reduce harmful substances released from e-cigarette use indoors but are not likely to eliminate them. Learn more about e-cigarette aerosol from the Centers for Disease Control and Prevention. The FDA faced a self-imposed court deadline at the end of this month to wrap up its yearslong review of major vaping brands, including Juul and Vuse. The last wave analyzed took place during the COVID-19 pandemic in March to November 2021 and was administered via audio computer-assisted self-interviews and telephone interviews. The study featured 1,985 participants