Story highlights An 18-year-old experienced difficulty breathing and chest pains after using an e-cigarette 
 
 Her doctors diagnosed hypersensitivity pneumonitis, or "wet lung" 
 
 (CNN) An 18-year-old woman working as a hostess in a rural Pennsylvania restaurant decided to try e-cigarettes, perhaps another of the innumerable bistro workers hoping to calm frayed nerves with a smoke -- or in this case, a vape. 
 
 This hostess, though, paid an unusual price for her e-cig use, according to a case study published Thursday in the medical journal Pediatrics. As usual for a patient report, the authors did not disclose the young woman's name to protect her privacy. 
 
 E-cigarettes heat liquid and turn it into vapor, which a user inhales and then exhales in a large puffy cloud. The liquid is known as e-juice, and it contains flavorings, propylene glycol, glycerin and often nicotine -- though many users are unaware of this final addictive ingredient. 
 
 The hostess had been vaping for only about three weeks last year when she developed symptoms bad enough to send her to the emergency room of the University of Pittsburgh Medical Center. 
 
 There, doctors recorded her issues: cough, difficulty breathing that was worsening by the minute, and sudden stabbing pains in the chest with every inhalation and exhalation. Not yet feverish, she showed no upper respiratory symptoms such as a runny nose or nasal congestion. In the past, she said, the only lung problems she had were from mild asthma, which rarely required the use of an inhaler. 
 
 Read More ||||| A 6-year-old girl in Oregon experienced severe nicotine poisoning after her parents accidentally gave her liquid nicotine meant for electronic cigarettes instead of a children's liquid pain reliever, according to a new report of the girl's case. 
 
 The child survived, but nicotine poisoning can be fatal, and the researchers warned that such cases could become more common as e-cigarettes rise in popularity. 
 
 "As electronic cigarette use proliferates, children are now increasingly at risk of toxicity from ingestions of much larger quantities of nicotine from highly concentrated refill liquid, as in our case study," Dr. Matthew Noble, an emergency medicine physician at Oregon Health and Science University, and a co-author of the report, said in a statement. 
 
 The girl had previously sprained her ankle, and was taking children's Motrin (which contains ibuprofen) for pain relief. But when the bottle was finished, the girl's mother used it to store some liquid nicotine that she had bought online to use in an e-cigarette. 
 
 The child's father didn't know the Motrin bottle contained nicotine, and he gave the child a 10-milliliter dose of the liquid for her pain, according to the report. The girl immediately felt a burning sensation in her mouth and throat, which led the father to take a small sip of the liquid. He realized it was liquid nicotine and immediately called poison control and an ambulance, the report said. [27 Oddest Medical Cases] 
 
 Before the paramedics arrived, the girl lost consciousness and began involuntarily jerking her limbs. She later regained consciousness, but did not respond to questions or commands, the report said. 
 
 The girl was taken to the emergency room, where she began vomiting and sweating, and her pulse dropped from 150 beats per minute to 60 beats per minute, the report said. 
 
 Doctors gave her an anti-nausea medication and a sedative, and placed a tube in her throat to keep her airway open. They also gave her a medical form of charcoal used to help treat drug overdoses, because it absorbs nicotine and other drugs. 
 
 About an hour after she arrived at the ER, the girl was admitted to the intensive care unit and placed on a ventilator overnight. The next day, she was taken off the breathing support and was able to respond to commands. Doctors gave her a physical exam, which showed normal results, and she was released from the hospital. 
 
 The researchers estimated that the child consumed about 700 milligrams of liquid nicotine. Some studies have estimated that ingesting as little as 500 mg of nicotine can kill an adult. An average regular cigarette delivers about 0.2 to 2.4 mg of nicotine. [10 Scientific Quit-Smoking Tips] 
 
 In addition, a blood test done about an hour after the girl arrived at the hospital showed she had a blood level of nicotine of 348 nanograms per milliliter. The level of nicotine in the blood after an adult smokes a regular cigarette is about 12 to 54 ng/ml, the report said. 
 
 The researchers also tested the liquid nicotine that the child ingested, and they estimated that the concentration of nicotine in the original product was more than double the concentration that was listed on the product label. 
 
 "This finding supports previous work demonstrating that electronic cigarette refill containers may have unreliable commercial labeling and widely variable actual nicotine concentration compared with that advertised," the researchers wrote in their report. 
 
 The report is published in the January issue of the journal Annals of Emergency Medicine. 
 
 Original article on Live Science.
– News of one scary vaping experience follows another. Days after authorities confirmed a Florida man died when his vape pen exploded, sending projectiles into his brain, a study published in the journal Pediatrics tells of an 18-year-old Pennsylvania woman who ended up in an emergency room with a cough and stabbing chest pains after trying vaping for only a few weeks. The condition of the unnamed woman with mild asthma only worsened after she was given antibiotics. She eventually suffered respiratory failure and had to be put on a breathing machine because "she was unable to get enough oxygen into her blood from her lungs," one of her doctors, Daniel Weiner of the University of Pittsburgh Medical Center, tells CNN. The woman also required tubes in her chest to drain fluid from her lungs—a result of hypersensitivity pneumonitis, otherwise known as wet lung. The condition is marked by an inflammation of the lungs caused by an allergen, like dust. In this case, doctors blame the chemicals in the e-cigarette the woman used, perhaps including propylene glycol, glycerin, and nicotine. Casey Sommerfeld, another of the woman's doctors, notes the immune response to such irritants "can lead to increased inflammation and 'leaky' blood vessels, which can lead to fluid accumulation in the lungs." However, the study authors note "this is the first reported case of [wet lung] and acute respiratory distress syndrome as a risk of e-cigarette use in an adolescent, and it should prompt pediatricians to discuss the potential harms of vaping with their patients," per the Sacramento Bee. Given a drug for severe allergic reactions, the woman in this case was back to breathing on her own after five days. ("Dripping" is another vape-related concern.)