What FEco level typically indicates a heavy smoker?

A fractional expired carbon monoxide (FEco) level of 20 ppm typically indicates a heavy smoker. This level suggests significant exposure to carbon monoxide due to smoking, as the inhaled smoke contains various harmful chemicals, including carbon monoxide, which is absorbed into the bloodstream.

Heavy smokers often exhibit higher levels of carbon monoxide, as their lungs are continuously exposed to tobacco smoke, leading to accumulation of carbon monoxide in their system. An FEco level of 20 ppm reflects a substantial degree of smoking activity and is commonly associated with individuals who might be smoking multiple cigarettes per day or engaging in particularly heavy smoking habits.

Lower FEco levels might be found in light smokers or non-smokers, while levels higher than 20 ppm are indicative of very heavy smoking, escalating the health risks associated with chronic exposure to smoke.