1. security code: find the security code of tobacco packaging, and then scan the code with the "scan" function of smart phone and Baidu browser. Wait 3 to 4 seconds, and detailed results will pop up. If the number of inquiries is not 1, then buy carefully.

2. Barcode: Find the barcode on the package, then scan the barcode with the "Sweep" function of WeChat and Alipay, wait for a while, and the query result will be displayed. If you can't find specific product information, buy it carefully, and beware of manufacturers counterfeiting barcodes.

3. China Item Coding Center: You can also search for "China Item Coding Center" in other search engines such as Baidu, and then enter the webpage to find the domestic bar code query box, then enter the bar code number, click the query button after confirmation, and wait for the query result.