“A study that analyzed 265 patients referred to just one hyperbaric oxygen therapy center for CO poisoning from 2015 to 2018 found that 22% (58 people) were associated with hookah, and that hookah-associated cases increased year after year. In the last two years of the study period, hookah was the most frequent source of CO poisoning.”

Can hookah cause carbon monoxide poisoning? These women learned the hard way. (usatoday.com)