Trial objectives are to evaluate the impact of a defined lung disease (COPD) on pharmacokinetic parameters of insulin and fumaryl diketopiperazine (FDKP) after inhalation of Technosphere®/Insulin (T/I), the investigational medicinal product. 40 non diabetic subjects, 20 COPD and 20 age/gender/BMI-matched non COPD subjects will participate in 3 visits: Visit 1 (screening), Visit 2 (subjects will undergo a euglycemic clamp procedure and be dosed with T/I) and Visit 3 (follow up visit).