Ingredients and hardware
CBD vape juice PG/VG guide: ratios and device compatibility
PG/VG ratios affect liquid thickness and device behaviour. There is no universal ratio that is automatically right for every CBD liquid, coil or pod.
Scope: this page compares product facts and official guidance. It does not recommend starting to vape, diagnose a condition or convert a symptom into a product.
Key takeaways
- PG and VG are carrier ingredients
- Ratios affect viscosity and hardware behaviour
- Compatibility must come from product and device instructions
- An undisclosed ratio is an evidence gap
What PG and VG mean
PG is propylene glycol and VG is vegetable glycerine. They are commonly used as carrier ingredients in e-liquids. A higher-PG formula is generally thinner, while a higher-VG formula is generally more viscous. Flavourings and the cannabinoid formulation also affect the finished liquid.
A ratio such as 50/50 describes the relative carrier mixture, not CBD strength. Concentration still needs the CBD total and liquid volume.
Why the device matters
Coils, wicking ports, power range and pod design differ. A liquid that behaves acceptably in one refillable device may not suit another. Follow the liquid manufacturer’s compatibility statement and the hardware instructions together.
Do not solve a compatibility problem by diluting the liquid, adding water, adding oral oil or mixing in an unidentified substance. Ask the manufacturer or retailer for a written specification.
What to check before filling a tank
Existing adult vapers should verify the whole setup rather than relying on a flavour name.
- The bottle explicitly says vape liquid or e-liquid
- PG/VG ratio or viscosity guidance is available
- The device is refillable and compatible
- The coil is within the recommended specification
- Ingredients and warnings are legible
- The bottle seal and expiry information are intact
How thCBDx treats missing ratios
If the retailer does not publish a PG/VG ratio, thCBDx records it as unavailable. We do not infer it from bottle size, flavour category or another product by the same brand. That evidence gap can affect label-clarity scoring.
Frequently asked questions
Is high-PG CBD liquid always better?
No. Suitability depends on the specific formulation and compatible hardware.
Is PG/VG the same as CBD strength?
No. PG/VG describes carrier proportions; mg/ml describes CBD concentration.
Can I thin CBD e-liquid myself?
Do not add an ingredient unless both product and hardware manufacturers explicitly support it.
Continue comparing CBD vape juice
Return to the independent CBD vape juice comparison for reviewed liquids, scores, concentration, unit value and the interactive calculator.
Relevant reviewed liquids
CBD vape products
CBD Vape Juice (5%)
CBD Vape Juice (5%) from Nordic Oil. Compare CBD vape products, 500mg CBD in the selected listed variant, 10ml format and available variants before visiting the retailer.
- Available CBD
- 500mg CBD
- Pack
- 10ml
£27.00
Price checked 2026-08-10
CBD vape products
CBD Vape Juice Blueberry
CBD Vape Juice Blueberry from Nordic Oil. Compare CBD vape products, 300mg CBD in the selected listed variant, Blueberry flavour, 10ml format and available variants before visiting the retailer.
- Available CBD
- 300mg CBD
- Pack
- 10ml
£17.50
Price checked 2026-08-10
Sources and checking notes
Official guidance and product information can change. Sources checked 4 August 2026.