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Smoking immediately upon waking may increase risk of lung and oral cancer

Date:
March 29, 2013
Source:
Penn State
Summary:
The sooner a person smokes a cigarette upon waking in the morning, the more likely he or she is to acquire lung or oral cancer, according to researchers.

The sooner a person smokes a cigarette upon waking in the morning, the more likely he or she is to acquire lung or oral cancer, according to Penn State researchers.

"We found that smokers who consume cigarettes immediately after waking have higher levels of NNAL -- a metabolite of the tobacco-specific carcinogen NNK -- in their blood than smokers who refrain from smoking a half hour or more after waking, regardless of how many cigarettes they smoke per day," said Steven Branstetter, assistant professor of biobehavioral health.

According to Branstetter, other research has shown that NNK (4-(methylnitrosamino)-1-[3-pyridyl]-1-butanone) induces lung tumors in several rodent species. Levels of NNAL (4-(methylnitrosamnino)-1-(3-pyridyl)-1-butanol) in the blood can therefore predict lung cancer risk in rodents as well as in humans. In addition, NNAL levels are stable in smokers over time, and a single measurement can accurately reflect an individual's exposure.

Branstetter and his colleague Joshua Muscat, professor of public health sciences, examined data on 1,945 smoking adult participants from the National Health and Nutrition Examination Survey who had provided urine samples for analysis of NNAL. These participants also had provided information about their smoking behavior, including how soon they typically smoked after waking.

The researchers found that around 32 percent of the participants they examined smoked their first cigarette of the day within 5 minutes of waking; 31 percent smoked within 6 to 30 minutes of waking; 18 percent smoked within 31 to 60 minutes of waking; and 19 percent smoked more than one hour after waking. In addition, the researchers found that the NNAL level in the participants' blood was correlated with the participants' age, the age they started smoking, their gender and whether or not another smoker lived in their home, among other factors.

The team published its results in the March 29 issue of the journal Cancer, Epidemiology, Biomarkers and Prevention.

"Most importantly, we found that NNAL level was highest among people who smoked the soonest upon waking, regardless of the frequency of smoking and other factors that predict NNAL concentrations," Branstetter said. "We believe these people who smoke sooner after waking inhale more deeply and more thoroughly, which could explain the higher levels of NNAL in their blood, as well as their higher risk of developing oral or lung cancer. As a result, time to first cigarette might be an important factor in the identification of high-risk smokers and in the development of interventions targeted toward early-morning smokers."


Story Source:

The above story is based on materials provided by Penn State. The original article was written by Sara LaJeunesse. Note: Materials may be edited for content and length.


Journal Reference:

  1. S. A. Branstetter, J. E. Muscat. Time to First Cigarette and 4-(Methylnitrosamino)-1-(3-Pyridyl)-1-Butanol (NNAL) Levels in Adult Smokers; National Health and Nutrition Examination Survey (NHANES), 2007-2010. Cancer Epidemiology Biomarkers & Prevention, 2013; 22 (4): 615 DOI: 10.1158/1055-9965.EPI-12-0842

Cite This Page:

Penn State. "Smoking immediately upon waking may increase risk of lung and oral cancer." ScienceDaily. ScienceDaily, 29 March 2013. <www.sciencedaily.com/releases/2013/03/130329125107.htm>.
Penn State. (2013, March 29). Smoking immediately upon waking may increase risk of lung and oral cancer. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2013/03/130329125107.htm
Penn State. "Smoking immediately upon waking may increase risk of lung and oral cancer." ScienceDaily. www.sciencedaily.com/releases/2013/03/130329125107.htm (accessed July 23, 2014).

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