Vaping products containing nicotine are regulated under the Tobacco and Related Products Regulations 2016 (TRPR) and need to be notified to the MHRA and comply to certain standards (for example, nicotine content is limited to 20 milligrams per millilitre (mg/mL)) before they can be legally sold in the UK.
Vaping products that do not contain nicotine come under the General Product Safety Regulations 2005, enforced by local authority Trading Standards departments.