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Acid reflux allows stomach acids and partially digested foods to move in the upward direction into the oesophagus and mouth, leading to the production of a sour or unpleasant odor

Smoking can cause an increase in liver enzymes

Assuming a total puff volume of ~400 mL/cigarette for the smoking protocol used [22], such deliveries correspond to a smoke benzene concentration of ~200,000 g/m 3 , and so a much higher risk from benzene for chronic use of tobacco cigarettes as compared to e-cigarettes

But hes hopeful that burden will ease up

There is no cure for COPD, so treatment will focus on reducing the symptoms and risk of complications