Good evening. A common additive ingredient of baked barbecue food is ethyl maltol and vanillin (vanillin, the volatile smell of vanilla purple potato ice cream) in a certain proportion. The aroma of roadside roasted tea-oil duck and roast chicken bacon is more than these two, and onion oil, garlic oil and gingerol can also present that snack street flavor to a certain extent. If it is non-edible, there are more solvent essential oils, such as D- limonene, jasmonate acetate, furanone and ionone, which can volatilize and diffuse as quickly as air fresheners with a little heating.