I claim the ornamental design for an inhalation device, as shown and described.
FIG. 1 is a right-front perspective view of the inhalation device;
FIG. 2 is a right side view of the inhalation device shown in FIG 1;
FIG. 3 is a left side view of the inhalation device shown in FIG. 1;
FIG. 4 is a front view of the inhalation device shown in FIG. 1;
FIG. 5 is a rear view of the inhalation device shown in FIG. 1;
FIG. 6 is a top view of the inhalation device shown in FIG. 1; and,
FIG. 7 is a bottom view of the inhalation device shown in FIG. 1.
The dash-dot-dash broken lines represent the boundaries of the claimed design and form no part thereof. The dash-dash broken lines illustrate the portions of the inhalation device which form no part of the claimed design.