If you have a continues smoke , better check your CCV's!
You should have 2 of them, left and right sides.
If like this is not good:
Get new, Amazon is cheap for 2 of them or get them original but pay 5,6 times more $.
For me i failed emission test at 5 minutes idle, and my CCV where replaced 4,5 months back, so i kind knew that my valve stem seals are gone, and i did replace them all the valve stem seals and passed smog/emission with no problems.