A new study of twins led by the University of Colorado Boulder shows that today's smokers are more strongly influenced by genetic factors than in the past and that the influence makes it more difficult for them to quit.
"In the past, when smoking rates were higher, people smoked for a variety of reasons," said sociology Professor Fred Pampel, a study co-author. "Today the composition of the smoking population has changed. Smokers are more likely to be hard-core users who are most strongly influenced by genetic factors."
The study showed that adult identical twins sharing a common genetic structure are significantly more likely to quit smoking at the same time compared with fraternal twins who do not share identical genes. This genetic influence has increased in importance among smokers following the initial restrictive legislation on smoking enacted in the United States in the 1970s, Pampel said.
"These days people don't smoke as much for social reasons," Pampel said. "They in fact face criticism for the habit but tend to smoke because of their dependence on nicotine."
The study, to be published in this month's edition of the journal Demography, was led by Associate Professor Jason Boardman and doctoral student Casey Blalock of CU-Boulder's sociology department and Institute of Behavioral Science, and co-authored with Pampel, also of IBS, Peter Hatemi of Pennsylvania State University, Andrew Heath of Washington University in St. Louis and Lindon Eaves of the Medical College of Virginia in Richmond.
Using a database of twins who responded to an extensive health questionnaire, the researchers examined the smoking patterns of 596 pairs of twins, 363 of them identical and 233 of them fraternal. The researchers looked at their smoking patterns from 1960 to 1980 because they wanted to focus on a period of changing views about smoking.
Among identical twins, 65 percent of both twins quit during a two-ye
|Contact: Fred Pampel|
University of Colorado at Boulder