Preventing children's tobacco use was particularly emphasized in the health-focused tobacco control policy expressed in the Tobacco Act of 1977. The effects of the policy on tobacco use have been monitored every second year by the Adolescent Health and Lifestyle Survey. Daily tobacco use by 14-18-year-olds decreased after the 1977 Tobacco Act, but the effect was short-term. A slow increase in daily tobacco use among the girls started in the mid-1980s. Changes were less consistent among the boys. As a consequence, sex differences have nearly disappeared. Today, girls aged 14-16 use tobacco more often than boys. Experimenting with tobacco has been postponed to an older age since the beginning of the 1980s, particularly among boys. The results of 2003 suggest that daily tobacco use is decreasing among the 14-16-year-olds, particularly among boys with the exception of 18-year-olds.