Smoking 318 need some ideas why?

If it was smoking really bad,, your exhaust system could be full of oil/tar,, and could take several miles driving to burn it out..

If you pull your plugs, and hopefully they've been in for a while,, look at the tips,, if you can see oil accumulated on one side of the electrodes,, it's likely valve guide seals, or less likely, intake manifold gskt...

If the oil covers the whole tip of the plugs,, or maybe just a couple,, that's likely rings...,..

There are more conclusive tests, but reading the plugs will tell you a lot..

hope it helps,,