Can we use nicotine packs or smoke vape while fasting? Mufti Abu Layth Can Muslims Smoke Vape Is Vaping Haram? Muslims at Parties Un Islamic' e cigarette habit catches like fire in Malaysia Can Muslims Smoke Weed? 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. Jakim reminds smokers that electonic cigarettes, vapes are 'haram'