A Study of the Safety and Levodopa Pharmacokinetics Following Single Dose Administration of CVT 301 (Levodopa Inhalation Powder) in Smoking and Non-Smoking Adults

Inclusion Criteria: * Body mass index (BMI) 18 to 32 kg/m2; * Forced expiratory volume in one second (FEV1) ≥80% of predicted for race, age, sex, and height; * FEV1/FVC (forced vital capacity) ratio ≥70%; * Smokers are defined as those currently smoking at least 10 cigarettes/day for at least 12 months with a positive urinary cotinine result and with no past (within 5 years) or present history of intrinsic lung disease (e.g. asthma, chronic obstructive pulmonary disease \[COPD\], chronic bronchitis, or other relevant conditions); * Non-smokers are defined as those who never smoked or were exposed to less than 1 pack year within at least 12 months and with a negative urinary cotinine result. Exclusion Criteria: * Subject who is not surgically sterile or female subject who is less than 2 years postmenopausal, and who does not agree to use a highly effective birth control method during the study and up to 3 months after the last dose of investigational product; * Any flu-like syndrome or other respiratory infections within 2 weeks prior to the Screening Visit; * History of chronic obstructive pulmonary disorder (COPD) requiring intermittent or continuous use of any oral or inhaled medication therapy within last 3 years; * Renal impairment as defined by a calculated creatinine clearance of ≤ 80 mL/minute; * History of syncope within the last 6 months.