So me and my friends would sniff semi regularly, maybe once a week or so. The product is from a decent source and we've never had problems with any substance we got from them. But recently, my friend found he couldnt get any feeling off his lines. Even when me and everyone else feel the effects after 3 or so decent lines, he feels unaffected. I was wondering if tolerance would even be relevant to his case, if its only once a week or so? I understand after taking a certain amount, you'll only maintain a high, but he says even his first line doesnt affect him. Any help would much appreciated