The epidemic of severe lung illness related to e-cigarettes continues to grow, federal officials say, as they try to pinpoint the exact cause.
The Centers for Disease Control and Prevention said as of Thursday there were 805 cases of confirmed or suspected vaping-related lung illnesses in 46 states and the Virgin Islands — up more than 200 since last week. Twelve deaths are reported.
Many of the victims say they used vaping products containing THC, the compound in marijuana that causes the high. But others say they only vaped nicotine.
The CDC is urging everyone to stop using e-cigarettes, but several states are not waiting for federal officials to take stronger action.
Massachusetts this week became the first state to temporarily ban all retail and online sales of e-cigarettes. The ban is set to last for four months.
Other states have stopped the sale of flavored vaping products, saying the fruit and candy flavors appeal to young people.
The largest e-cigarette maker, JUUL, announced this week it will stop advertising its products.
E-cigarettes heat up liquid inside a cartridge and create a nicotine-filled vapor.
A team of US scientists has found that the concentration of carcinogen metals like lead, nickel, iron and copper in electronic cigarette aerosols, or vapour, has increased since tank-style electronic cigarettes were introduced in 2013.
Electronic cigarettes, which consist of a battery, atomizing unit and refill the fluid, are now available in new tank-style designs, equipped with more powerful batteries and larger capacity reservoirs for storing more refill fluid.
But the high-power batteries and atomizers used in these new styles can alter the metal concentrations that transfer into the aerosol, said researchers from the University of California, Riverside.
“These tank-style e-cigarettes operate at higher voltage and power, resulting in higher concentrations of metals, such as lead, nickel, iron, and copper, in their aerosols.
“Most of the metals in e-cigarette aerosols likely come from the nichrome wire, tin solder joints, brass clamps, insulating sheaths, and wicks, components of the atomizer unit,” said Monique Williams, a post-doctoral researcher and the first author of the paper that appeared in the journal Scientific Reports.
The researchers examined six tank-style electronic cigarettes and found all the aerosols had metals that appeared to originate in the atomizers.
Further, they found the model with fewest metal parts in its atomizer had the fewest metals in its aerosol.
Of the 19 metals they screened, aluminium, calcium, chromium, copper, iron, lead, magnesium, nickel, silicon, tin and zinc were from components in the atomizing units.
“We found the concentrations of chromium, copper, lead, nickel, and zinc exceeded the proposed permissible exposure limit from the Occupational Safety and Health Administration,” Williams said.
Chromium, lead, and nickel are known as carcinogens. Prolonged exposure to chromium could cause gastrointestinal effects, nasal and lung cancer, respiratory irritation, and lung function impairment.
Prolonged exposure to lead could produce vomiting, diarrhoea, cardiovascular effects, and lung cancer.
Nickel inhalation could cause lung disease, damage to the nasal cavity, lung irritation, lung inflammation, hyperplasia in pulmonary cells and fibrosis.
The researchers have analyzed the following six tanks and their atomizers: Kangertech Protank, Aspire Nautilus tank, Kanger T3S tank, Tsunami 2.4, Smok tank and Clone.
“The presence of heavy metals, including some known carcinogens, in e-cigarette aerosols is concerning because with prolonged exposure they could cause adverse health effects,” said Prue Talbot, a professor of cell biology, who led the research team. (IANS)