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That figure is controversial and might be a little high, says Kenneth Warner, a tobacco policy researcher at the University of Michigan. But, he adds, "The worst critics of e-cigarettes would probably argue they're a half to two-thirds less dangerous. But from a practical view, they're probably on the order of 80% to 85% less dangerous, at least." A 2015 expert review from Public Health England estimated e-cigs are 95% less harmful than the real thing.

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.

They usually contain nicotine, which is the addictive chemical in cigarettes. E-cigarettes do not contain tobacco, which is the harmful part of cigarettes that causes cancer. By comparison, traditional cigarette sales have fallen by 5.2% since July 2023, while smokeless and oral nicotine products — led foremost by Zyn products — are up 11.8% as a category. Amid the increasing popularity of e-cigarettes and vapes among young people, health experts from PGIMER have raised concerns. They pointed out that many young people mistakenly think that e-cigarettes are "cool" because of their flavours, sleek designs, and social appeal. Experts warn that this misconception greatly increases the chances of non-smoking youth using regular cigarettes.

Children and adults can develop nicotine poisoning from swallowing, breathing, or absorbing e-liquid through their skin or eyes. E-cigarette use can also result in serious injury due to defective batteries that have caused fires and explosions. Vaping and smoking both involve inhaling nicotine and other substances into the lungs. While cigarettes burn tobacco that produces smoke, e-cigarettes heat liquid to make an aerosol that often contains nicotine, various chemicals, heavy metals (nickel, tin, and lead) and small particles that can be inhaled deeply into the lungs.

E-cigarettes are not risk-free but are believed to cause less harm than smoking. They do not burn tobacco or produce tar or carbon monoxide&nbsp