Single-use electronic cigarette mouthpieces that are fillable with tobacco substitutes for inhalation and smoking; Single-use cigarette tubes for use with a heat-not-burn device; Single-use electronic cigarette mouthpieces that are fillable with tobacco substitutes for inhalation and smoking, sold empty; Single-use cigarette tubes for use with a heat-not-burn device, sold empty; Devices for heating tobacco substitutes for the purpose of inhalation; Boxes specially adapted for and containing single-use electronic cigarette mouthpieces that are fillable with tobacco substitutes for inhalation and smoking; Boxes specially adapted for and containing single-use cigarette tubes for use with a heat-not-burn device