Also, depending on how much it's affecting your stack size, in tournaments it can be incorrect to call while chasing, even if you are getting the odds. This is because your EV for made hands later is drastically higher than just about anything you could make based on the odds the pot is offering you at that point (due to rising blinds). Losing chips = less power to capitalize on better hands later (when the blinds are bigger and the pots matter more).