don't really believe that. It's either just a coincidence or you're not in contact with many people when you do dope hence not getting sick or you don't notice when you have a minor cold because you are high. Opiates prevent cough, mask pain, can give you energy, or relax you. They are basically the perfect mask for a illness. I remember thinking this a few times when I was using opiates hard core, but then I started to keep an eye on myself closely. I noticed that a few times I had a sore throat but couldn't feel it cause I was so high. The way I could tell was because my throat was so swollen that it was hard to swallow and my glands were swollen as well, but I sure as hell didn't feel sick. It was crazy how much it covered it up especially if you didn't think about any of the symptoms because most of the time it would be the dope or opiates causing hot flashes, or maybe you thought you were starting to w/d. Damn, I even thought that it was the opiates causing my throat to swell up, but it was just a bad cold/sore throat