A tobacco processing system for processing tobacco includes a tobacco mixing device for mixing an additive in the tobacco, a tobacco supplier for supplying the tobacco to the mixing device, and an additive supplier for supplying the additive to the mixing device. The mixing device includes a mixing housing which encloses the tobacco and additive to form a mixing chamber in which the tobacco and additive are mixed and a gas stream unit which is operatively connected to the mixing housing and configured to provide a gas stream which moves the tobacco and additive through the mixing chamber.