The ornamental design for an electroniccigarette, as shown and described.
FIG. 1 is a front devotional view of an electronic cigarette showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a front, right, and top perspective view thereof; and,
FIG. 8 is a rear, left, and bottom perspective view thereof.
The broken lines in the figures are included for the purpose of illustrating portions of the electronic cigarette that form no part of the claimed design.