That number has jumped by 275 cases, or a 52% increase from 530 last week. Also on Thursday, a spokesperson for the Moses H. Cone Memorial Hospital confirmed the first vaping-associated death in North Carolina, raising the number of deaths to 13.
The CDC figures included fatalities in 10 other states, including Mississippi, Georgia and Florida, which all reported their first deaths linked to vaping this week.
Nearly three-quarters of the reported cases are male. About 38% of the cases were linked to people 21 years or younger, the CDC said.
"All reported cases have a history of e-cigarette product use or vaping, " the CDC said in a release.
The CDC, the Food and Drug Administration and local authorities have opened up investigations into lung injuries linked to vaping over the past few weeks. The FDA is conducting a criminal probe.
At a hearing before House lawmakers on Tuesday, Anne Schuchat, principal deputy director of the CDC, said vaping-related injuries had far surpassed the previously reported estimate of 530 and that officials believe the eight reported fatalities linked to the practice have also been exceeded.
Lawmakers have criticized the release of vaping products into the market without any safety testing or trials.
E-cigarettes usually contain nicotine, flavorings and other chemicals. Most of the products involved in the reported injuries or illnesses are believed to be black-market ones that include tetrahydrocannabinol (THC), a psychoactive ingredient in marijuana, though Dr. Schuchat said in her testimony that the chemical wasn't necessarily the culprit.
No single ingredient or additive has been implicated in all cases, she said. The CDC is referring to these cases only as lung injury.
Patients have reported initial symptoms like breathing difficulty, coughing, chest pain and fatigue, officials said, which gradually grow worse and have resulted in hospitalization. Some patients also experienced diarrhea and vomiting.
A large percentage of illnesses have been in young people, reflecting the popularity of vaping among youth.