Abstract: A method and a device for conditioning tobacco leaves or parts thereof in a coil or bobbin in which the tobacco material is conducted towards or away from a stretched belt portion of a reel, wherein a conditioning medium is continuously fed to the windings of the bobbin containing the tobacco material and to at least part of the belt portion extending away therefrom in order to control the tobacco leaf material already during winding on or off respectively of the bobbin so that the aforesaid storage and treatment conditions respectively can be better controlled.