Vapor-emitting devices according to various embodiments of the invention include active end of use indicators to warn users that it is nearing the time and/or time to replace the vapor-emitting device or a refill for the device. Some embodiments of the vapor-emitting devices include intrusive actuation of the end of use indicator, while other embodiments include non-intrusive actuation of the end of use indicator. The indicators may be visual and/or auditory cues for notifying users it is nearing the time and/or time to replace the vapor-emitting device or a refill for the device.