The ornamental design for a mouthpiece for a vapingdevice, as shown and described.
FIG. 1 is a front view of a first embodiment of a mouthpiece for a vaping device;
FIG. 2 is a rear view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a perspective view thereof;
FIG. 5 is a front view of a second embodiment of a mouthpiece for a vaping device;
FIG. 6 is a rear view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a perspective view thereof.
In FIGS. 1, 2, 4-6, and 8, the broken lines at the bottom of drawing in each Figure depict portions of the mouthpiece for a vaping device that form no part of the claimed design. In FIGS. 1 and 5, the broken lines of the letters and the broken line surrounding the letters depict exemplary environmental structure and form no part of the design to be patented. In FIGS. 1-4, the oblique lines are transparent.