Do Nicotine Pouches Break a Fast? Yes and Here's How 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 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 Smoking Break Wudu? Scholars' Opinions and Guidance Ulum Al Azhar Academy