The mouthpiece (10) for an aerosol-generating article is formed from at least two main parts (30, 40) that can be axially inserted into each other to define an aerosol flow path (20). The two main parts are axially moveable relative to each other between a first assembled position and a second assembled position. The mouthpiece further comprises an activatable element (28) for modifying upon activation a characteristic of an aerosol. Upon movement of the two main parts from the first assembled position into the second assembled position, the activatable element is activated. The invention is also directed to an aerosol generating system comprising the mouthpiece and a method for assembling the mouthpiece.
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