When e-cigarettes entered the market, a flurry of studies suggested they could be much safer than tobacco cigarettes.
From the difference, it has been concluded that the metals had come from the coils.
"One of the things that is troubling is that the metals in e-cigarette coils, which heat the liquid that creates the aerosol, are toxic when inhaled, so perhaps regulators might want to look into an alternative material for e-cigarette heating coils", Ana María Rule, who led that study and the most recent one from Johns Hopkins, said in a release at the time.
In the study, the scientists examined e-cigarette devices owned by a sample of 56 users. A large number of the devices were found to produce aerosols with potentially risky levels of lead, as well as other metals such as chromium, manganese and nickel. The researchers tell that the repeated exposure to these metals can affect liver, lungs, immune system.
"It's important for the FDA, the e-cigarette companies and vapers themselves to know that these heating coils, as now made, seem to be leaking toxic metals, which then get into the aerosols that vapers inhale", says senior researcher Ana María Rule, assistant scientist in environmental health and engineering in Johns Hopkins University's Bloomberg School of Public Health.
A new study discovered critical traces of metals, for example, lead leak from e-cigarette heating coils into the vapor.
Vaping is increasingly becoming popular among teenagers, young adults, and existing smokers looking to quit smoking. However, among 10 users significant levels of arsenic were found in refill e-liquid, tanks and aerosol samples.
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A new study finds e-cigarette vapors may contain potentially unsafe levels of toxic metals, including lead and arsenic.
The Food and Drug Administration has the authority to regulate e-cigarettes and e-liquids.
Although minimal levels of metals were found in the e-liquids within refilling dispensers, the metal contamination transferred to aerosols produced by heating the e-liquids.
"[While] using e-cigarettes instead of conventional cigarettes may result in less exposure to cadmium", the researchers said, they do not protect users from "other hazardous metals found in tobacco".
However, the source of the lead and how metals get into the surrounding e-liquid remains a mystery.
Researchers from Johns Hopkins Bloomberg School of Public Health tested e-liquids in the refilling dispensers of 56 daily e-cigarette users both before and after vaping, as well as the aerosols users inhale.