No code

After working several months on a quite intense at times telemetry floor. I have heard several nurses say "That person really should be a no code, because of their illness or being in varying degrees of heart block will do them in anyway and their won't be anything we can do". I was just wondering. Isn't it still the patient's choice to decide whether or not they want to be resucitated and not the nurse or doctor pressuring the family into it for convienence purposes. I realize that some people really should be a no code for obvious reasons, but if a person who's only problem is what the monitor is showing and they are asymptomatic then why automatically say "they need to have a code order written". Maybe this is coming from someone who has never run a code before (knock on wood) but when I hear people saying things like this I find it quite discouraging. As if the patient hasn't lost enough control just by being in the hospital. What do other people think or am I just naive?