Harvard University conducted a study that has the tobacco companies on the defensive. The results of the study show that the tobacco companies have been manufacturing cigarettes that have higher nicotine content. This means that people become more addicted and it will be harder for them to quit should they want to.
The study was conducted using data that these companies provided themselves, from the period of 1997 to 2005. They provided their filter designs as well as their measurement of nicotine per stick of cigarette and how many puffs it would take to finish a stick. The nicotine levels rose in all brands, in all categories irregardless of whether it was regular, menthol, light or ultra light. The increase was as much as 10% says Greg Connolly, one of the authors of the study and former director of the Tobacco Control Program of the state health agency.
Major tobacco manufacturer, Philip Morris, is challenging the findings of this study. They insist that while the nicotine levels may have fluctuated a little per batch, the 1997 and 2006 batch have identical nicotine levels.