Many cannabis consumers eventually wonder how long vape oil actually lasts before it goes bad. The answer depends on several factors—how it’s made, how it’s stored, and whether it has been opened. Generally, a well-formulated, unopened vape cartridge can stay fresh for 12 to 24 months when stored in the right conditions: cool, dark, and upright. Over time, cannabinoids and terpenes gradually degrade when exposed to heat, light, or oxygen, which can reduce both potency and flavor.

THC naturally oxidizes into CBN as it ages, especially when exposed to air and light. This change can make the effects of an older vape cartridge feel weaker or more sedative. CBD is also sensitive to its environment, and it tends to break down more quickly under higher temperatures or bright light. For consumers who store cartridges in warm areas—like cars, bathrooms, or windowsills—this process accelerates dramatically.

Terpenes, the aromatic compounds that define a strain’s scent and taste, are even more fragile than cannabinoids. They evaporate and oxidize easily, which means flavor and aroma are usually the first qualities to fade. A cartridge that once tasted fresh and vibrant may start to taste dull or slightly harsh once the terpenes degrade, even if the oil still contains cannabinoids.

Opened cartridges have a shorter life span than unopened ones. Once the seal is broken, air exposure and repeated heating cycles begin to alter the oil’s chemistry. For the best experience, most experts suggest finishing opened cartridges within six to twelve months. Storing them properly can slow degradation—keeping them cool and out of direct sunlight helps maintain stability and taste for longer.

Proper storage is key to preserving vape oil quality. Storing cartridges upright prevents leaks and helps keep the wick saturated. Keeping them in a dark drawer or cabinet, away from light and heat, prevents the main drivers of oil breakdown—oxidation, light exposure, and thermal stress. Avoiding drastic temperature swings also helps keep the oil from thickening or separating.

Not all products come with a clear expiration date, and regulations vary depending on the state. Some packaging includes only batch numbers and production dates, while others provide a “best by” guideline. In many dispensaries, products are cycled out after a year not because they’ve spoiled, but because compliance testing certifications have expired.

In simple terms, unopened vape oil remains good for up to two years if stored correctly, while opened cartridges are best within a year. Changes in color, smell, or consistency are strong indicators the oil may be past its prime. Consumers can rely on reputable brands that use high-quality materials, low-oxygen packaging, and light-resistant containers to help ensure a longer shelf life.

Learn More: Why Some Vape Oils Cost More—And When They’re Worth It