This is an open label, parallel group study to evaluate the pharmacokinetics (PK) and safety of a single dose of CVT-301 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.