Another example is Fijian 'kava' (a root that is crushed and dried into a powder, then filtered into water and consumed as a drink). It has a reverse tolerance:

Another example is Fijian 'kava' (a root that is crushed and dried into a powder, then filtered into water and consumed as a drink). It has a reverse tolerance: those who consume it more frequently typically get more affected by it, and those who've had little before may not feel any effect.