My 360 Magnum Dodge started smoking blue overnight, and I mean a LOT of smoke?

It was fine, just literally fine one day, left it for a week, and now it`s blue. You can`t stand near it or you`ll choke on the smoke. Does not clear after running for a minute or 2. Oil level is topped up as always, sounds like it`s running fine, I don`t understand this at all any ideas?