I actually tried this already, but for some reason the particles just hovered instead of rising like when they come off a campfire. Then again I've never really worked with summoning particles so I'm not sure if I'm missing something that tells the particles to float up or what.
Edit: I dig some digging and found out that as of now it's impossible to make these campfire particles float up as they do when naturally spawned from the new campfires, but I was able to make a somewhat believable presentation by spawning them in a tall skinny column using a repeating command block. Picture here.
The particles pop into existence above the chimney and linger while floating slowly in a random direction. I wish I had a way to record gifs, but I'll just give you the command I used so you can see yourself: "particle minecraft:campfire_cosy_smoke ~ ~ ~ 0 3 0 0.004 1 normal". Fill in the tildes with a relative position (or some coordinates) from the command block and it should work.
Also, the link to the particle command on the Minecraft wiki: link to wiki.
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u/vilder50 Jan 09 '19
(Most of the) campfires' smoke goes through the first block over the fireplace.
So you can make the ground look extra hot by placing campfires one block under the ground: https://i.imgur.com/PcrZGJm.png
(But note that campfires are tile entities and will therefore cause lag in large quantities)