what could cause my truck to start smoking? on 1997 Chevrolet S10

I changed the pvc valve but it's still smoking. The oil is good.

Asked by for the 1997 Chevrolet S10
Blown head gasket, if white smoke, running rich, if black smoke, valve guides/seals, if blue smoke.
Thank you very much
U welcom. Just some possibilities. Really needs to be checked by a mechanic!