The answer is yes, your furnace can start smoking if you don't take the necessary precautions to keep it in good condition.
When a furnace starts emitting smoke or an unpleasant smell, it can be caused by several different factors. First and foremost, it could be due to debris or dirt buildup on the heat exchanger or burners.
This can cause soot to accumulate inside the unit which will then burn off when your furnace is running, resulting in smoke. Another common reason for smoking is a malfunctioning blower motor fan which can cause overheating of the unit and lead to burning of nearby parts such as wires or insulation material.
Lastly, having a clogged air filter can also contribute to fumes and smoke coming out of your furnace since it affects the air flow in your home and can lead to high levels of natural gas accumulation.
If you think your furnace is smoking, it's important to shut off the unit immediately and contact a professional HVAC technician for further inspection. A faulty furnace can pose health risks such as carbon monoxide poisoning if not addressed right away.
Make sure to keep up with regular maintenance checks and clean out any debris that may be blocking the exhaust or venting system. This will help keep your furnace running safely and properly all year long. Hope this article helped!