If you were thinking that Assassin's Creed IV: Black Flag needed more smoke, then you are in luck. An update just came out on the PC that adds PhysX support, so the particle effects can be more complex. In Black Flag this means that there is more smoke, and it should behave more realistically.
I am personally a fan of PhysX, and wish more games would use it or another good physics engine. Arkham Asylum had great cloth physics for Batman's cape, and Mafia II had amazing explosions because of PhysX. I know that a lot of people don't care for the technology, because you need to have a really good PC to see the benefits, and a lot of games don't use it. Hopefully that changes in the future, because nice particle effects can really change how a game looks.
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