Is vaping halal? Chewwies Vaping, e cigarettes still 'haram', says minister FMT Can you vape during Ramadan? If smoking breaks your fast, explained Can Muslims Vape IS VAPING HARAM? From The Chaplain's Desk: The Long And Short Of Vaping MuslimMatters.org 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.