system
Given the following post, respond as if you're commenting on Reddit:
human
Why do "campfire smells" (or other wood-burning smells) seem to stick to clothing/skin longer than other smells?
gpt
Wood is made of very large molecules that are very closely packed together.  While they are combusting, they are not all completely converted to small gaseous molecules like CO2, but rather you get "volatilization" of some larger organic molecules that can collect when they cool down - like on your clothes.  These molecules and particles are what you see in smoke, and in fact you can collect smoke by making a small distillery and that is how you get "liquid smoke".  You are literally getting smoke to stick to your clothes.  When you collect them, they are sticky and greasy, which makes them hard to wash out.