Final answer:
Smoke produced by natural unfinished materials changes to carbon dioxide (CO2) and water vapor (H2O) through chemical reactions.
Step-by-step explanation:
When natural unfinished materials like wood are burned, the smoke produced undergoes chemical changes. The carbon in the wood reacts with oxygen in the air to form carbon dioxide (CO2) and water vapor (H2O), which are the main components of smoke. Additionally, depending on the conditions of the combustion, other substances such as carbon monoxide (CO) and particulate matter can also be present in the smoke.