For example, among smokers who had undergone thoracic surgery, people who smoked more than 80 pack-years showed a 100% increase in ACE2 receptors compared with people who smoked fewer than 20 pack-years, the authors noted

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In an electronic-cigarette burn or a hot-liquid burn that has been swallowed, there can be swelling further down the throat, and the books warn that breathing difficulty is a red flag needing urgent medical care
An Upper Gastrointestinal (GI) Series or Barium Swallow provides a set of X-rays showing the esophagus, stomach, and small intestine