While public and private groups, along with researchers and a few drug companies, have been making serious efforts to help smokers quit smoking cigarettes, the tobacco industry has been spiking the level of nicotine in cigarettes, according to a study by the Department of Public Health. Between the years 1998 to 2004, the amount of nicotine in cigarettes has risen by ten percent.

According to Lois Keithly , director of the Massachusetts Tobacco Control Program, "We in public health have tried to spend a lot of time figuring out why people don't stop smoking."

Full withdrawal will be felt after the first day of not smoking. But symptoms from nicotine withdrawal are felt within the first 30 minutes after the last cigarette, with smokers reporting cravings within the first hour after the last cigarette. In one hour, smokers reported anger. In three hours of smoking cessation, smokers reported heightened levels of anxiety, sadness and difficulty concentrating. Nicotine is what makes cigarettes so addictive.

The Boston Globe reports when contacted, representatives of the three major tobacco makers in the US declined to comment on the study and would not answer questions about the nicotine content of their products.