The smoke effects ingame are kinda limited now. Such as when landing a helicopter in desert/sandy terrain it just creates small dust/smoke effects even though in real life its much bigger wich also adds the challange that pilots need to land before the dust cloud hits up & blocks the visibility.
Video (Desert RL): https://www.youtube.com/watch?v=RKlrvf3lUxk

Then for the normal smoke it kinda misses a lot. Would love to see something like this instead:
Video: https://youtu.be/CsnQyIBfUSM?t=3m30s

Also for Rocket-launchers the smoke at the backblast is limited. I would love to see a little bit more smoke coming out of those launchers like in real life.