Does vaping break a fast?

Vaping adds 0 kcal to a fast, because e-cigarette vapour has no calories. On calories alone, a vape does not end a weight-loss fast the way a snack or a milky coffee would. Flavoured e-liquids are breathed in, not eaten, so they add no calories either. The calorie count is the only part of the answer that favours vaping.

The site's own framework rates each item for four goals: weight loss, blood sugar, autophagy and gut rest. Smoking, vaping and alcohol are never marked safe for any goal, whatever their calories. Vaping is grey for all four. The grey verdict means vaping adds no calories to the fast. It says nothing good about vaping during a fast or at any other time.

Most vapes contain nicotine. Nicotine is highly addictive and harmful to health. No tobacco product is safe, and that includes e-cigarettes. E-cigarettes should not be used by children, teenagers, young adults or pregnant women. If you are pregnant, talk to a doctor before you fast as well.

Cigarettes have their own entry in this database. They have no calories either, and tobacco kills more than 7 million people a year. Nicotine gum is in the database too. It has a few calories, so its verdicts differ from vaping.

If you want to stop vaping or smoking, a doctor or pharmacist can talk you through the options for stopping. A fast is no reason to start vaping, and no reason to vape more while you wait for your eating window.