Muslims are required to abstain from consuming any food or drink during the fasting hours from dawn (Fajr) until sunset (Maghrib) and sexual relations between spouses are prohibited during the fasting hours. Following breaks the Fast:

1. Smoking: Smoking cigarettes or other forms of tobacco breaks the fast, as it involves inhaling substances into the body.
2. Vomiting Intentionally: If someone intentionally induces vomiting, and it is mouth filled, their fast is broken. However, if vomiting occurs unintentionally, it does not invalidate the fast.
3. Menstruation and Postnatal Bleeding: Women who are menstruating or experiencing postnatal bleeding (postpartum bleeding) are exempt from fasting during those days. They should make up the missed fasts later, when they are able to do so.
4. Ejaculation: Ejaculation due to sexual activity or self-stimulation breaks the fast. It’s important to avoid such activities during fasting hours.
5. Eating or Drinking Forgetfully: If a person forgets they are fasting and eats or drinks something unintentionally, their fast remains valid. However, they should stop as soon as they realize what they are doing.
6. Deliberate Consumption: Any deliberate consumption of food, drink, or any of the prohibited actions mentioned above intentionally breaks the fast.