Can you smoke or vape when fasting? Just like eating and drinking, smoking or vaping is not permitted while fasting. If someone smokes or vapes while they are fasting, the fast will Ist Vapen Haram Does Vaping Break Wudu? Does Vaping Break Your Fast?, Sayyid Kashmiri explains that, according to Sayyid Sistani, both vaping and smoking invalidate the fast as a matter of obligatory precaution. Does Vaping Break Your Fast? Here's What You Need to Know Does Vaping Break Wudu? Islamic Ruling on Ablution 2025