Introduction: Why your high disappears in the light

THC is not a stable compound – as sensitive as the plant itself. Too much heat, air, or light is enough to alter its molecular structure. The result: edibles, oils, or weed lose potency, aroma, and effect. Here you'll learn how cannabinoids degrade – and how to prevent this.

THC is a sensitive molecule.

THC (Δ9-tetrahydrocannabinol) belongs to the so-called phytocannabinoids – organic, reactive molecules that readily react with oxygen, UV radiation, or heat . This reaction primarily produces CBN (cannabinol) – a breakdown product that has little psychoactive effect but can be mildly sedating.

1. Heat – the invisible enemy

Heat accelerates chemical processes – including the breakdown of THC. At around 30°C , the structure begins to slowly degrade. The longer cannabis or edibles are exposed to heat, the more their potency decreases.

• Storage in hot cars in summer → up to 30% loss of active ingredient in one week
• Baked goods in the sun → THC oxidizes to CBN
• Decarbing at too high a temperature → THC is "cooked away"

Tip: Store at a constant temperature of 15–20 °C away from direct heat sources.

2. Light – the silent potency killer

UV light breaks down bonds in the THC molecule. Sunlight and bright artificial light are particularly dangerous – even a few days are enough for a noticeable loss of the active ingredient.

• After 10 days of UV exposure, THC loses up to 50% of its potency .
• Dark storage (brown glass, Mylar bags) significantly slows down this process.

Tip: Store cannabis products in dark, UV-protected containers – light is the fastest way to ruin a good high.

3. Oxygen – the slow decomposer

O₂ reacts with THC to form oxidation products – mainly CBN . This process occurs continuously as soon as air comes into contact with the product.

• The smell changes: less sweet, more earthy or musty.
• The color darkens over time (especially with oils).
• The effect becomes more "drowsy", less euphoric.

Tip: Use airtight containers – ideally vacuum-sealed or purged with nitrogen. Every hour of exposure to oxygen reduces potency.

How THC becomes CBN – the chemical process

• Δ9-THC → Oxidation by O₂ → CBN (Cannabinol)
• CBN has a mild sedative effect, but hardly any psychoactive effect.
• This makes the high feel "tired" instead of "euphoric".

This explains why old weed often has a more relaxing effect – it contains more CBN than THC.

4. Moisture – the mold accelerator

Moisture doesn't directly destroy THC, but it promotes mold and microbial growth . This is especially risky with edibles, as they are food products. Moisture + warmth = perfect breeding ground for mold.

Tip: Store in a dry place – silica gel packets in tins or bags are a reliable solution.

Here's how to effectively protect your THC

Optimal storage location: A dark, cool, dry cupboard – not a refrigerator, not a windowsill, not a car.

How long THC remains stable

• In Mylar bags: up to 2 years
• In dark glasses: 12–18 months
• In room light and air: 1–2 months until significant loss of potency.

Temperature and airtightness are crucial. Even a few degrees difference can cost months of durability.

Conclusion: Stability is science

THC is delicate – but not helpless. Darkness, coolness, and airtight storage will preserve its potency, flavor, and effects for months. Every gram deserves respect – and the right environment to retain its full potential.

Frequently Asked Questions (FAQ)