I think some people get reverse tolerance but it is very rare and more typical of "hard heads" the kind of folks who will insist they arent feeling a thing even when they are all chatty off the pouni ono. Ive got two friends who are this way. They dont get offered kava very offen, lol. But at least one of them recognizes the effects more now that it hes attempted it maybe 4 times now. Then for the people who are in tune with what goes into their body, it is more like kavasseur says, where we hear the kava more the more we drink it. In this case we feel the effects thd first time, but they are more in the background. Then as we drink more and more the effect become more distinctive and powerful. The way kava effects me now is nothing like it did when i started. Originally it was a very warm head feeling with almost no physical properties that I could detect. Now i can be incredibly sedated, heavy, or even stimulated by kava.