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E-cigarettes also expose users to toxic heavy metals, according to the NASEM report, as well as cancer-causing chemicals, though in most cases at lower levels than traditional cigarettes

Researchers instructed participants not to smoke for at least 1 hour before measurements to avoid any acute effect of smoking

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Infection with any pathogen (viral, bacterial, fungal, protozoan or helminthic) in any location of the body may be associated with the use of corticosteroids alone or in combination with other immunosuppressive agents that affect cellular immunity, humoral immunity, or neutrophil function