Describes aerosol drug delivery devices currently employed for the treatment of respiratory diseases, and their potential application for delivering other medications, such as measles vaccination and insulin. Topics of the 14 contributions include developmental changes in respiratory function, particle diameter measurement and particle size statistics, factors affecting the clinical outcome of aerosol therapy, in vivo measurements of lung dose, new nebulizer technology, the metered-dose inhaler, propellants, spacer devices, and dry powder inhalers