04-20-06 [poker]I've written about this a bit before, but there's a key point about drawing in NL : you can draw to good draws (like the nut flush) for big bets, eg. pot size bets, but ONLY if you know your opponent has a hand and so will pay you off when you hit. If you already have information telling you he has a hand, then go ahead and call down. If not, you must either raise or fold. You can NOT draw when he might be on a bluff. By raising, you might fold higher draws that would stack you if you hit (eg. higher flush draws), and you also make sure he folds junk so you're up against a hand.
Consider for example : he bets $4 on the flop, you call, he bets $8 on the turn, you call. If you hit, that's nice, but he might actually just be bluffing here or also have a draw.
For the same amount of money : he bets $4 on the flop, you raise to $12, he calls. He checks turn, you check.
You put in the same amount of money for your draw, but in the second case he'll fold the pure junk, so if you hit your draw, he has some kind of hand and is much more likely to pay you off, so your implied odds are way better. Of course this only works in position.