E-cigarettes contain flavouring chemical linked to deadly ‘popcorn lung’

Source: The Telegraph Author: Sarah Knapton, Science Editor Public health experts are sharply divided about e‑cigarettes Photo: ALAMY   Three quarters of e-cigarettes tested by Harvard scientists contained the chemical diacetyl which is known to cause lung damage. Vapers could be at risk of developing the deadly disease ‘popcorn lung’ after scientists found a toxic chemical in 75 per cent of flavoured electronic cigarettes. Diacetyl, a chemical which is used as a butter substitute in flavours like Cotton Candy and Cupcake, has been linked to respiratory disease bronchiolitis obliterans Although it is thought to be safe when eaten, the United States National Institute for Occupational Safety and Health has said it could be hazardous when inhaled over a long period. It follows incidences in several factories which manufacture microwave popcorn where workers developed bronchiolitis obliterans. Diacetyl is known to cause inflammation, scarring and constriction of the tiny airways in the lung known as bronchioles, reducing air flow. There is currently no known cure except for a lung transplantation. Researchers said 'urgent action' was needed to 'evaluate this potentially widespread exposure via flavoured e-cigarettes.' "Recognition of the hazards associated with inhaling flavouring chemicals started with 'Popcorn Lung' over a decade ago,” said lead author Joseph Allen, assistant professor of exposure assessment science at Harvard T.H. Chan School of Public Health. “However, diacetyl and other related flavouring chemicals are used in many other flavours beyond butter-flavoured popcorn, including fruit flavours, alcohol flavours, and, we learned in our study, candy flavoured e-cigarettes." E-cigarettes use [...]