@ months after the end of programme implementation , students of intervention classes showed significantly lower rates for lifetime smoking ( adjusted OR = @ ; @ % CI @ to @ ; p = @ ) and incidence of smoking ( adjusted OR = @ ; @ % CI @ to @ ; p = @ ) , a higher increase of smoking-related knowledge ( adjusted = @ ; @ % CI @ to @ ; p < @ ) and a greater change in attitudes towards a more critical perception of risks and disadvantages of smoking ( adjusted = @ ; @ % CI @ to @ ; p = @ ) .