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E-cigarettes consist of a mouthpiece, an e-liquid chamber, an atomiser and a battery. The atomiser has a wicking material that draws the e-liquid onto a battery-powered heating coil. Optimal vapour production depends on an efficient supply of e-liquid to the heating coil, which is limited by the wicking and rate of e-liquid evaporation10,11,12. Power levels that produce aerosol beyond the ability of the wick to resupply the liquid to the coil may result in overheating of the atomizer coil and consequently overheating of the e-liquid10,11. Different types of wicking material, varying in size and shape, have been used in e-cigarettes3,13.

In 2022–‍2023, 2.3% of people in Australia both smoked regular cigarettes and used e‑cigarettes, an increase from 0.7% in 2016. In the second study, researchers analyzed heart blood flow, a measure of coronary vascular function, of 19 young adult smokers immediately before and after smoking either e-cigarettes or tobacco cigarettes. They examined coronary vascular function by a myocardial contrast echocardiography while participants were at rest and after performing a handgrip exercise to simulate physiologic stress. In the first study, researchers looked at the impact of e-cigarettes on lipids and glucose in the blood. They recruited 476 healthy human participants without cardiovascular disease who were either nonsmokers, e-cigarette-only smokers, smokers of e-cigarettes and tobacco cigarettes and those who smoked tobacco cigarettes only.

Many thousands of people in the UK have already stopped smoking with the help of an e-cigarette. An e-cigarette is a device that allows you to inhale nicotine in a vapour rather than smoke. E-cigarettes refers to the device and vaping is the use of the device.

Before this study —&nbsp