CSD170304: Study to Assess Nicotine Uptake in Smokers From Electronic and Combustible Cigarettes

This will be a single-center, randomized, open-label, parallel study during which up to 210
healthy adult subjects, consisting of 35 subjects per product group, will be enrolled.
Subjects will be evaluated for plasma nicotine uptake, as well as overall product liking. The
study will involve the use of five different marketed ECs or one CC in tobacco consumers who
are exclusive smokers (i.e., naïve EC users) or dual users of cigarettes and ECs (i.e.,
intermittent EC users).

Inclusion Criteria:

1. Able to read, understand, and willing to sign an Informed Consent Form (ICF) and
complete questionnaires written in English.

2. Generally healthy males and females, 21 to 60 years of age, inclusive, at Screening
Visit.

3. Subjects must meet one (a or b) of the following tobacco use conditions:

1. Exclusive cigarette smoker who self-reports smoking ≥ 10 cigarettes per day for
at least 6 months prior to Screening Visit. Brief periods of abstinence more than
30 days prior to Screening due to illness, quit attempt, or clinical study
participation will be allowed at the discretion of the Principal Investigator
(PI).

2. Dual user of CCs and ECs who self-reports:

i. Smoking ≥ 10 cigarettes per day for at least 6 months prior to Screening Visit.
Brief periods of abstinence more than 30 days prior to Screening due to illness, quit
attempt, or clinical study participation will be allowed at the discretion of the PI;
and ii. Using a nicotine-containing "cig-a-like" EC or a tank system EC either daily
or at least weekly for at least 3 months prior to Screening Visit.

4. Willing to be confined overnight and abstain from tobacco- and nicotine-containing
product use (with the exception of study IP use) for 12 hours prior to IP use through
Study Discharge.

5. Willing to use assigned IP during the study according to protocol.

6. Expired breath carbon monoxide (ECO) level is ≥ 10 parts per million (ppm) at the
Screening Visit and Study Day 1.

7. Positive urine cotinine test at the Screening Visit and Study Day 1.

8. No intent to quit smoking or vaping from Screening to Study Day 2.

9. Females of childbearing age must be willing to use a form of contraception acceptable
to the PI from the time of signing informed consent until Study Discharge, or be
surgically sterile for at least 90 days prior to the Screening Visit.

Exclusion Criteria:

1. Presence of clinically significant or unstable/uncontrolled acute or chronic medical
condition at the Screening Visit, as determined by the PI, that would preclude a
subject from participating safely in the study (e.g.,, uncontrolled hypertension,
chronic lung disease, cardiac disease, neurological disease, or psychiatric disorders)
based on safety assessments such as clinical laboratory tests, pregnancy tests,
medical history, and physical/oral examinations.

2. At risk for heart disease, as determined by the PI.

3. Systolic blood pressure of > 160 mmHg or a diastolic blood pressure of > 95 mmHg,
measured after being seated for 5 minutes.

4. Weight of ≤ 110 pounds.

5. Poor peripheral venous access.

6. Use of medicine for treatment of depression, unless on a stable dose for the past 6
months prior to screening and deemed clinically stable by the PI.

7. Current on scheduled treatment(s) for asthma within the past consecutive 12 months
prior to screening. If potential subject is on an as-needed treatment, such as rescue
inhalers, subject may be included at the PI's discretion pending approval from the
Medical Monitor.

8. Any history of cancer, except for primary cancers of skin such as localized basal
cell/squamous cell carcinoma that has been surgically or cryogenically removed.

9. Use of any medication or substance that aids in smoking cessation, including but not
limited to any nicotine replacement therapy (NRT) (e.g., nicotine gum, lozenge,
patch), varenicline (Chantix®), bupropion (Wellbutrin®, Zyban®), or lobelia extract,
within 30 days prior to the Screening Visit.

10. History or presence of hemophilia or other bleeding disorders.

11. History or presence of clotting disorders with concomitant use of anticoagulants
(e.g., clopidogrel [Plavix®], warfarin [Coumadin®, Jantoven®], aspirin [> 325
mg/day]).

12. Participation in another clinical trial within 30 days prior to the time of consent.
The 30-day window for each subject will be derived from the date of the last study
event in the previous study to the time of consent of the current study.

13. Positive test for human immunodeficiency virus (HIV), hepatitis B surface antigen
(HBsAg), or hepatitis C virus antibody (anti-HCV).

14. Females who have a positive pregnancy test or who are pregnant, breastfeeding, or
intend to become pregnant during the course of the study.

15. Females ≥ 35 years of age currently using systemic, estrogen-containing contraception
or hormone replacement therapy.

16. A positive urine drug screen without disclosure of prescribed corresponding
concomitant medication(s) at the Screening Visit or on Study Day 1.

17. A positive alcohol breathalyzer result at the Screening Visit or on Study Day 1.

18. Employed by a tobacco or nicotine-manufacturing company, the study site, or handles
tobacco or nicotine-containing products as part of their job.

19. Determined by the PI to be inappropriate for the study, including a subject who is
unable to communicate or unwilling to cooperate with the clinical staff.