re: Poker & When to stop the continuation bets?
First a matter of terminology (as I see it):
Continuation bet: Betting post-flop without a strong made hand after raising preflop, because you think you still have the best hand based solely on the likelihood that your opponent hit nothing. Technically, this is a weak value bet. You think you're ahead and you don't want anyone drawing out on you for free.
Bluff: Betting when you think you are behind in order to get your opponent(s) to fold.
I would say betting again on the turn would never be a continuation bet. While it's possible you're just up against a draw, you're behind so often in that situation that I'd consider it a bluff.
If your preflop raise got called by two or more players, and you totally miss the flop, I would often consider just betting the flop a bluff. The likelihood of none of the other players having a pocket pair, pairing something on the board, or having a higher high card, is very low. It depends on the other players' styles and the texture of the board. Betting AT on a 268 rainbow board against two loose players might be a continuation bet. Against tight players on a KQ9 board, not so much.
So reassessing whether you're really continuation betting or bluffing
might be enlightening. You might find that you really bluff A LOT, which can be really easy for your opponents to exploit.