Why are cool-mist vaporizers rather than steam vaporizers recommended in the home treatment of respiratory infections? a. They are safer. b. They are less expensive. c. Respiratory secretions are dried by steam vaporizers. d. A more comfortable environment is produced. ANS: A Cool-mist vaporizers are safer than steam vaporizers, and little evidence exists to show any advantages to steam. The cost of cool-mist and steam vaporizers is comparable. Steam loosens secretions, not dries them. ...