There are a lot of players who don’t really know how to handle draws correctly. This issue doesn’t only concern new players, but also some vets. If you lose way too much money on draws then you probably ain’t playing them the right way. It’s not so rare that some people make their biggest losses with draws.
There is a simple solution for this problem called Odds & Outs. You can solve this pretty much with math alone. If the pot odds are in your favour then you pay, if they are not then you simply fold. The biggest mistake you can make with draws is to play them according to your gut instincts. If you do that then you will lose some money for sure, at least on the long run.
Especially when on NL tables you should never forget about the implied odds. That is also the reason why we hardly ever can fold draws against a bet on the flop. On the turn things look differently.