I am not saying a continuation bet is wrong here, or -EV, I'm just saying that you can't do it every time with thinking players. Harrington agrees, see HOH2. This seems to be as good a spot as any to mix it up and not continue.

The point is that if you do it every time, and I pick up on it, I will just reraise you and you will almost NEVER win with a continuation bet, meaning they are -EV. Of course you can mix up a continuation bet (in appearance) when you actually have a hand and that may cover some of the difference, but I think the proper way to go is to mix it all up. Sometimes continue w/ nothing. Sometimes check w/ nothin. Sometimes continue w/ hand. Sometimes check w/ hand. Reads matter.