Is it hot in here?

Lately I seem to be putting more and more hot sauce on my food, of hotter and hotter varieties. Today I picked up these ghost pepper (one of the hottest peppers in the world) chips from Trader Joe's and found them only mildly hot. Have I burnt out my taste buds? They are really good - like spicier barbecue chips.

Should I be worried when ghost pepper doesn't seem hot to me?