The 1 mg rule defines legal THC vape pens in the UK: each container must contain less than 1 mg THC to be exempt from controlled drug laws. These pens are non-intoxicating and compliant with UK standards. Illegal vape pens, by contrast, contain higher THC amounts similar to recreational cannabis and can cause a high.
Legal products are manufactured with transparency, testing, and clear labelling. Illegal versions may have unknown strength, contaminants, and carry the risk of prosecution if possessed. For consumers, the difference comes down to safety, legality, and peace of mind.
