With the release of the new Red Bull Carbon Cub, as well as the previously released trailer for MSFS 2024, it’s clear that a smoke system is now being implemented into the sim. However, something I’ve immediately noticed is that the smoke does not linger in the air very long - in fact - it almost immediately disappears. This means you can’t make smoke loops, you can’t fly through your own smoke, you can’t turn your plane around to see the smoke because it disappears way too fast. I tend to do a lot of aerobatics and barnstorming in MSFS, so I’d love to see the smoke system get some much needed improvements to make it more realistic and make it a much better experience for users of MSFS/MSFS24.
Example 1 - the newly released Red Bull Carbon Cub
Example 2 - the MSFS24 trailer
As you can see above, the smoke trails don’t last very long. They don’t linger in the air, and don’t dissipate, they just quickly fade to nonexistence. This unfortunately takes away from the “fun factor” of smoke. They also have very sharp edges. Not quite as soft as smoke should look.
In real life, smoke tends to linger a lot longer as it slowly spreads and dissipates. You can make full loops and various shapes with them. Here are some real-world examples for reference:
A GREAT example within the sim is DC Designs’ smoke system. As you can see the smoke is soft and lingers in the air. It slowly spreads, thins, and dissipates. You can easily create full loops, and wind seems to affect how long the smoke lingers. This shows that a more realistic smoke can be implemented, and this is almost exactly what I’d love to see out of a native smoke affect. It’s just plane fun! 
While this topic may not matter to some, I cannot stress enough how much fun a smoke system can be if implemented properly. There’s nothing more fun than doing a nice big barnstormer loop and flying back through your own smoke. It’s an amazing experience, and I hope with some changes to the native smoke system going forward, that can be something everyone can experience and enjoy.