I have bad valve seals. But after that smoke cleared yesterday there was a faint smoke that looked more like coolant than oil. that is what made me check. and then the back flow had me worried.
it is not using coolant or overheating. but when I bought the truck some things were hidden from me and it does have some mechanical issues. So I am skeptical when something happens that I am not used too.
Thanks for everyones replies, it makes me feel better to know that it is normal.