Smoke from behind engine

How much smoke? Was there just a service performed?

Can you please upload a video of the smoke so we can get on the same page with you.

Smoke is caused by many things but most of them are related to a fluid of some sort getting on something hot. So I suspect you have an oil leak or coolant leak and it is dripping on the exhaust or something else hot enough to cause it to smoke.

The other major cause is when components are rubbing on each other creating heat which causes smoke.

Due to it coming from the location you are talking about, an oil leak or fluid leak is the most likely cause.

Do you have any performance issues?