system
Given the following post, respond as if you're commenting on Reddit:
human
Can a gas/smoke stick to an adhesive surface? And if so, at what density would it require for this to possible?
gpt
Smoke or gas? They're very different. A gas is a chemical that is above its boiling point and has evaporated, like water vapor, oxygen, and other components of our atmosphere.

Smoke is a colloid, a solid aerosol to be specific. It's made of solid particles of ash/soot suspended in the air, which absolutely do eventually settle on surfaces, which is why the smell of cigarettes persists in a smoker's car or house for a long time; the sticky smoke particles stick to any porous surface and are difficult to remove.