First, sorry if this is a duplicate. I searched for similar symptoms on this site and found no other issues where the problem went away on its own.
Yesterday after five minutes of neighborhood driving, I accelerated after a right-turn-on-red (so accelerating a little heavily) and saw a great deal of white (maybe blue) smoke coming out of my tail pipe, and at the same time experienced a loss of acceleration (or perhaps my transmission shifted in a strange way, I'm not sure) then the smoke was thin (almost none) and the acceleration returned to normal.
I drove home (a few blocks) let the car sit for a few hours and then took it for a spin to see if there was any smoke. There was none.
I drive a 2013 Hyundia Elantra sedan with automatic transmission.
Why would I get a lot of smoke out of my car, and then the smoke goes away? All of the issues I've read about do not seem like problems that would go away.
Edit: The mechanic replaced a PCV valve that was stuck open. An answer listing this as one of the possible causes and an explanation can get the bounty.