A new study finds some brands of cigarettes have increased the amount of nicotine they deliver. This is likely to make them more addictive, according to the researchers.
They studied data provided to the Massachusetts Department of Public Health by four major cigarette companies from 1997 to 2012, as required by state law. They found while the average amount of nicotine in cigarettes has remained fairly stable in recent years, the average amount of nicotine delivered from smoking a cigarette increased from 1.65 milligrams in 1999, to 1.89 milligrams in 2011.
This 15 percent increase could have been the result of a redesign of some brands of cigarettes, The Boston Globe reports. Lead researcher Thomas Land said cigarette makers could have changed the filter or length of their products to increase the efficiency of nicotine delivery.