in a weird kind of way, what you are saying makes no sense...but at the same time it makes perfect sense. the same thing happens to me, but it depends on the situation i'm in while its happening. if its being used as a pregame tool to jumpstart the night, and i'm drinking and hanging out, i dont really need anymore for awhile to keep the high. just walk away from the group of friends and do a bump every once in awhile. if its all we're doing that night....then i get this face and "fiend for it" as you say....can't get enough...a very rare feeling and something quite scary to behold