2 main things to consider. One, it depends on the density and time. The longer you are breathing in a higher density of smoke, the more your body will absorb. That you have control over.
Two, what you don't have control over is how detailed they can detect it and at what level they consider it a problem.
For example, lets say on a scale of 1 to 100 your body has a concentration of 5. If their detection can only detect 10 or higher, your safe. If you have an 11, they probably can detect it, but it'll be so low they might not say anything since it's so low.