What are typical breath sample results for non-smokers and smokers?

The carbon monoxide levels in your breath are measured in parts per million (or ppm). Breath carbon monoxide levels for non-smokers and smokers vary, but usually, the levels are:

• 6 ppm or lower is typical for non-smokers
• 10 ppm or higher is typical for smokers

Breath carbon monoxide levels of 7, 8, or 9 ppm could be from smokers or non-smokers. Non-smokers could have these levels if high levels of carbon monoxide are in the air around them.  Smokers could have these levels if they stop smoking for an extended period of time.