Disposables have a lifespan. You'll know it's time to retire yours when the flavor turns burnt, the vapor gets weak, or the battery just won't hold a charge. Don't try to squeeze every last drop—it's not worth the harsh hit.

When you do replace it, dispose of the old one properly. Many vape shops have recycling bins, and some manufacturers offer mail-in programs. Check with your local waste management for e-waste guidelines. It's a small effort that keeps lithium batteries out of landfills.