low-tar cigarettes can reduce your chances of getting a type of lung cancer, but they increase your risk of another type of lung cancer, according to a study reported in next month's issue of cancer . The work, carried out in Switzerland, supports the prevailing belief that low tar cigarettes are not much safer than their predecessors high octane.
Fabio Levi of Vaud tumor registry in Lausanne, Switzerland, and colleagues analyzed 7423 cases of lung cancer reported between 1974 and 1994 in two Swiss states, Vaud and Neuchâtel. The group found that the incidence of squamous cell tumors in larger lung tubes in men fell 27% from 1974 to 1979 in 1989-1994. Meanwhile, the rate of adenocarcinoma, which affects cells secreting mucus from the lungs, increased by 142% over the period. Overall, the rate of lung cancer in the region increased slightly, from 55.6 to 57.5 cases per 100,000 people.
Swiss researchers blame the cancer rates of lung shift on phase-in since the mid-1950s to mid '80s cigarettes containing lower tar, which is rich in carcinogens. Therefore, they say, smokers have less tar deposits in major pulmonary tubes, which represents the rate of less tumor there. But the smoke low tar cigarettes is easier to breathe and tends to get sucked deep into the lungs. Levi's group suggests that this deep breathing offers more carcinogens in smaller pulmonary branches, where adenocarcinoma develops
The authors acknowledge that other factors -. dietary changes to air pollution - can be at least partly responsible for the shift in the type of lung cancer. Nevertheless, the study confirms similar trends in US cancer rates, said Neal Benowitz, a researcher of nicotine at the University of California, San Francisco. Switching to low-tar cigarettes, he said, can reduce the risk of certain diseases, but it will not protect you against the real killers: "You will not change your risk of cancer or heart disease. "
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