If you're a daily user, weigh these trade-offs based on how you vape. If you go through a device in a few days, freshness matters less—you'll use it before it degrades. But if you stretch a device for weeks, heat and bulk-buying issues will hit you harder. For flavor chasers, prioritize keeping the device cool and buying smaller quantities. For budget vapers, bulk is fine, just store the extras in a cool, dark drawer.

Here's a quick checklist for summer:

• Keep your device out of direct sunlight.
• Never leave it in a parked car.
• If the vapor tastes burnt, give it a break—the coil might be too hot.
• Store backups in a cool, dry place.
• Buy from sellers with fast turnover.