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These low levels of reported smoking among COVID-19 patients may reflect the difficulty of obtaining accurate smoking histories among seriously ill patients, especially when most medical facilities are operating at or above normal capacity

Significant differences across conditions were found for formaldehyde and acetaldehyde (p 0.05)

A blank or negative control (well with no cells) was included to normalize the background for subtraction

Components of secondhand smoke include benzene, cadmium, formaldehyde, and acetaldehyde all known carcinogens. Many of the same known carcinogens found in secondhand smoke can also be found in other common workplace exposures, including diesel exhaust and welding fumes