smoke tracer in a sentence

1. This disqualified nicotine, a common tobacco-smoke tracer for indoor studies, because it tends to break down between the gas and particle phases.
2. In Version 1.1, more weapons were added, such as Napalm, Smoke Tracers, and Liquid Dirt as well as Joystick support and two new death animations among other things.
3. It's difficult to find smoke tracer in a sentence.