Ultrasound technology has allowed us a window to look inside, but in many ways our technology has outstripped our ability to understand what we're seeing
Since CTA ridership is still significantly lower than 2019 volume, that means the average passenger is somewhat more likely to experience a battery than they would have been before COVID

The composition of the aerosol depends on the ingredients in the liquid, the electrical characteristics of the heating element, the temperature reached, and the characteristics of the wick.[10] E-cigarette liquids generally consist of glycerol (vegetable glycerin), propylene glycol, and nicotine.[10] In Layden and colleagues case series of persons who vaped and developed EVALI, 60% used a combination of THC and nicotine, 27% used THC alone, and 11% used nicotine alone.[5] Vaping fluids containing THC have been formulated with oils, such as vitamin E acetate, whereas most nicotine-only products are mixed with propylene glycol and glycerin.[11,12] Vitamin E has been implicated in the bronchoalveolar-lavage fluid in EVALI patients.[11] Flavoring agents such as diacetyl, which is commonly found in e-fluids containing nicotine, have been shown to cause bronchiolitis obliterans and other severe respiratory diseases in exposed plant workers.[13] However, even though several large cohort studies were published in 2019, no single constituent was common to all cases

9 Smoking cessation is not associated with the worsening of psychiatric illnesses and improves psychiatric symptoms
Crafted with precision by the esteemed John Middleton Co
Thus the group known as The Restorers of Mount Carmel was born