The work aims to solve the problem of "water mist" on the cigarette packet products, and analyze the effects of raw material of cigarette packet products (such as paper, varnish, printed film on the printed matter and cut tobacco) and printing technology on the "water mist". The sources of "water mist" were found by the weight loss method. The varnish system, with the use of physical-chemical synergy, was created to eliminate the "water mist". When the mass fraction of nano-silica was 0.15% and the mass fraction of anti-mist agent was 0.15%, the "water mist" was completely eliminated, and it was found that the product quality requirements were met when the surface smoothness of printed matter was 8000～14 000 s. The paperboards, printing UV ink and varnish, etc. of the packaging box are the sources of "water mist". The tightness of BOPP film coated on the outside and the change in external temperature provide the environment where the "water mist" is formed. It can be judged whether the water mist occurs by measuring the surface smoothness of printed matter.