The present invention relates to an improved feed mechanism of a smoke generating device, and in particular to a feed mechanism having an adjustable auger that allows smoke generating materials of selected sizes to fall from a deposit tube in an improved manner. According to one advantage of the present invention, the feed mechanism has a bin with opposed sides, the first of which having a smokehouse mount with an air hole therein and the second side having a motor mount thereon. A tube extends from the smokehouse mount. An auger is adjustably received within the tube to advance material from the bin to a hole in the tube at the opposite end of the auger. Bearings are provided for allowing the height of the auger within the tube to be adjusted to accommodate smoking materials of a selected size.