A Smoking Cessation Study to Understand the Biological and Functional Changes After One Year of Smoking Cessation

The BoExp to be measured are selected based on:

1. HPHCs derived from the list of HPHCs recommended for lowering in cigarette smoke by the
World Health Organization (WHO),

2. draft guidance on "Reporting Harmful and Potentially Harmful Constituents in Tobacco
Products and Tobacco Smoke" by the Food and Drug Administration (FDA),

3. HPHC specific to the source of exposure,

4. BoExp to an HPHC easily detectable using reliable, reproducible, precise analytical
methods,

5. HPHC reflecting a specific toxic exposure or being a reliable surrogate of exposure to
HPHCs,

6. the list of HPHCs including HPHCs from both gas and particulate phase,

7. the list of HPHCs including a broad variety of chemical classes and organ toxicity
classes,

8. representing HPHCs formed at different temperature levels.

Inclusion Criteria:

- Current healthy smoker as judged by the Principal Investigator(s) or designee(s).

- Subject is aged from 30 to 65 years old (inclusive).

- Subject has smoked for at least the last 10 years.

- Subject smoked more than 10 cigarettes/day on average over the last year.

- Subject is willing to quit smoking within the next 30 days.

Exclusion Criteria:

- Subject has clinically relevant medical conditions that in the opinion of the
Investigators would jeopardize the safety of the participant or affect the validity of
the study results.

- Subject has (FEV1/FVC) < 0.7 and FEV1 < 80% predicted value at post-bronchodilator
spirometry.

- Subject with FEV1/FVC < 0.75 (post-bronchodilator) and reversibility in FEV1 that is
both > 12% and > 200 ml from pre- to post-bronchodilator values.

- Subject who took or is taking concomitant medication which may have an impact on the
"smoker's heath profile".

- Female subject is pregnant or is a breast-feeding.

- Female subject does not agree to use an acceptable method of effective contraception.