good idea it does that in real life.

actually i dont think so. most if not all saves that use smoke use hot or warm smoke. i dont think I have ever seen a save with smoke below 20C-15C which is where it would start to sink

tho...before this happens im quite curious as to see if anyone could come up with an interesting use for cold smoke......

Cool effect?

totally

Actually, I think that smoke needs another change as well. It needs to have a byproduct. The byproduct would be CO2 and dust (which would be essentially ash). How it would work is when you use a type of filter, it would separate the 2 byproducts from smoke. This would make it to where there would be a lot more simulations. Secondly, there should also be a way for PLNT to change CO2 into Oxygen. This would also add a lot of simulations. Smoke will but of course still produce oxygen with plant but there would be a less chance of plant catching on fire if we used the method I suggested. BTW, I actually wouldn't mind smoke sinking while cooled. It would be a good way to make smog in city creations.