Smoke Out of the Exhaust

What colour of smoke? Does the smoke have a smell? Does it smoke only on startup then slowly goes away? Or is the smoke consistent through the running? How many miles on it since you first started it? If you rev it does the smoke go away?

Smoke can be a lot of things. Like others mentioned. Ring's seating. But that shouldn't take very long at all. Headers? If there is paint on the inside of the headers that could be it too. Etc etc. Details my man, details! A video would be best.