In a statement released Wednesday, officials with the CDC said that between June 28 and Aug. 20, nearly 150 cases of severe lung illnesses linked to e-cigarettes were reported in 15 states.
Health officials continue to investigate the illnesses. According to the CDC, no specific product or compound has been linked to all of the cases and it remained unclear Friday whether the cases shared a common cause.
Poison control officials have been concerned about exposure to vaping products, including e-cigarettes and liquid nicotine, in recent years due to the high concentration of nicotine when compared with other tobacco products, according to the American Association of Poison Control Centers.
Association officials said that as of July 31, poison control centers have managed 2,439 cases connected to e-cigarette devices and liquid nicotine this year. Last year, officials fielded 2,470 such cases, according to figures from the association.