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"So far, we have not found an exposed environment where you cannot measure it any more," says Georg Matt, chair of the Department of Psychology at San Diego State University in California

That instinct is understandable HEPA filtration is genuinely excellent at capturing fine airborne particles, including the PM2.5 that makes wildfire smoke so hazardous and the fine soot released by cigarettes

To stay on the market, companies must show that their e-cigarettes benefit public health

Harmful chemicals in electronic cigarettes While a limited numbers of studies have been conducted on EC to date, scientific studies have been identified hundreds of chemicals in the vapors of EC