The design is the visual features of the ELECTRONIC CIGARETTE shown in the figures, whether they are features of shape, configuration, ornament or pattern, or a combination of such features, apart from any portions shown in stippled lines. In the attached figures: Figure 1 is a perspective view of an ELECTRONIC CIGARETTE according to the present design; Figure 2 is a front view thereof; Figure 3 is a rear view thereof; Figure 4 is a right side view thereof; Figure 5 is a left side thereof; Figure 6 is a top thereof; and Figure 7 is a bottom view thereof.