Is it possible to build up a resistance to capsaicin?

For those of you who don’t know, capsaicin is the stuff behind the heat in chili peppers. As I’ve gotten older I find myself adding more and more (as well as hotter and hotter) hot sauce to things. I absolutely love habañero chilis and hot sauce, yet the heat factor seems to be less and less intense and I find myself adding more to my food. Do you think if I lived long enough spicy food would loose its effectiveness on me? Is this possible? It’s not as if I’ve lost my ability to taste, it’s just that the hot stuff seems to have become blander than it once was.