Lung Cancer and Passive Smoking
Author Information
Author(s): Nicholas Wald, Kiran Nanchahal, Howard Cuckle, Simon Thompson
Primary Institution: St Bartholomew's Hospital Medical College
Hypothesis
What is the effect of exposure to other people's smoke on the risk of lung cancer?
Conclusion
The study suggests that the risk of lung cancer among non-smokers living with smokers is about 50% higher than that of non-exposed non-smokers.
Supporting Evidence
- The risk of lung cancer among non-smokers living with smokers is about 50% higher than in non-exposed non-smokers.
- Biochemical data suggests that non-smokers living with smokers have urinary cotinine levels equivalent to smoking about 0.3 cigarettes a day.
- Darby and Pike's estimates of risk are considered too high based on biochemical markers.
Takeaway
If you live with someone who smokes, your chances of getting lung cancer are higher, almost like smoking a little bit yourself.
Methodology
The study reviewed epidemiological studies and estimated risks based on biochemical markers of tobacco smoke exposure.
Potential Biases
The estimates may be biased due to the exclusion of certain non-smokers with higher cotinine levels.
Limitations
The study acknowledges uncertainties in extrapolating biochemical data to epidemiological data.
Participant Demographics
Non-smokers living with smokers.
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