The particles that make up smoke and clouds have important differences, which explains how they appear.
Why do clouds maintain their integrity instead of dispersing uniformly into the atmosphere? - Quora
21 Words to Describe the Movement of Smoke - Writing Tips Oasis - A website dedicated to helping writers to write and publish books.
Wildfire smoke travels far but never really disappears
Why Is the Sky Blue? NOAA SciJinks – All About Weather
Why does smoke disperse but clouds seem to stick together?
Shark antibodies could be a tool to fight future coronavirus
How do clouds in the sky maintain a relative shape over time instead of just wispily blending with the air around it like smoke in wind? - Quora
See Why the Sky Is Blue and Sunset Is Red - Easy Experiment
Why do clouds 'clump' together? Wouldn't it make much more sense or be much more likely for them to distribute evenly? - Quora
Why does smoke disperse but clouds seem to stick together?
Why Is the Sky Blue? NOAA SciJinks – All About Weather