I think it is genetic, to a degree. I could handle about 50M SKU 8 years ago, but now I cannot get it hot enough. I actually use ground hab as a condiment like most people use pepper. I think that over time you build up a tolerance to capsicum. My 13 year-old son and I grow quite a large collection of peppers, with Habs being the predominant choice. Every fall we make hot sauce and in the beginning he wouldn't touch the stuff. Now he spoons it right out of the pot on the stove while my wife won't even be in the house for fear of the fumes. I have a 7 year-old black lab and he hates anything peppery, even black pepper. Even now and then when he's begging for whatever I'm eating I toss him something coated with either Jim's Red Savina, (my favorite) or dusted with ground hab (yeah, I'm a sick puppy) and he goes bonkers for the next 10 minutes, you'd think he'd learn... Regards, Dan www.americanspice.com I think that hot sauce tolerance in genetic. Or maybe there is a hot sauce chromosome in the back of the brain. Right next to the one for sex drive or the need to drink an adult beverage now and then. I once met a 4 year boy who was addicted to Marie Sharp's mild.