A machine for conditioning packets of cigarettes is divided into a first portion defined by a number of outlets of a hopper through which cigarettes are fed in a first direction; a second portion in which a succession of adjacent conveyors defines a single supply path for the cigarettes and relative packets, the supply path extending substantially in a second direction crosswise with respect to the first direction; and a third portion in which a drying conveyor defines a number of parallel drying paths extending in a third direction crosswise with respect to the second direction.