1. First, hold the welcome cigarette and shake it vigorously. If you feel a little shaky inside, it's real smoke, otherwise it's fake smoke.

2. Second, look at the pinholes. Those with pinholes were left when the welcome cigarettes were mechanically packed. Fake cigarettes are not mass-produced, they are all artificially packaged, and there are no pinholes.

3. Then look at the package of welcome cigarettes. The packaging of regular cigarettes is very good, whether it is trademarks, patterns or colors, it is very clear. Fake cigarettes will see vague words and ghosts, or dark and light colors.

4. Finally, look at cigarette butts. Authentic welcome cigarettes are cut flat and the thickness is relatively uniform. There are steel seals, machine numbers and months on cigarettes, which are very clear. There are no fake cigarettes.