By Lisa Rapaport (Reuters Health)
E-cigarette liquids sweetened with flavorings like vanilla and cinnamon may harm the lungs even when they don't contain nicotine, a U.S. study suggests.
Researchers examined what happened to monocytes, a type of white blood cell, upon exposure to flavoring chemicals used in popular e-cigarette liquids. None of the liquids contained nicotine, but the flavoring chemicals still appeared to increase biomarkers for inflammation and tissue damage, and many of them also caused cells to die.
Over time, this type of cell damage can lead to wide range of lung problems including fibrosis, chronic obstructive pulmonary disorder, and asthma, said senior study author Irfan Rahman, an environmental health researcher at the University of Rochester Medical Center in upstate New York.
"Nicotine-free e-liquids have generally been considered safe; however, the impact of flavoring chemicals, especially on immune cells, has not been widely researched," Rahman said by email. "This study shows that even though flavoring compounds are considered safe for ingestion, it is not safe for inhalation."