From the airport's website FAQs:

3. Smoking

Where can I smoke at the airport?

Charlotte Douglas International is a smoke- free facility. Smoking is prohibited in all public areas, which includes all restaurants and bars. The smoke-free policy does not impact airline clubs, which are considered non-public areas.

Smokers on the front curb of the terminal are encouraged to use courtesy areas on each end of Baggage Claim and Ticketing levels.

The smoking areas are marked - and the areas outside baggage claim are marked where you can't smoke.