Hotbox is a slang term that is commonly used to describe the act of smoking or vaping inside an enclosed space. This term may not be appropriate in all settings, so it is useful to know some synonyms. Some common synonyms for hotbox include hot room, smoke-filled room, and enclosed space for smoking. Other possible synonyms include smoking lounge, vapor lounge, smoking parlor, and smoking den. It is important to be aware of these synonyms to better understand the context in which they are used and to ensure that communication is clear and effective.