Opportunity, on the other hand, can refer to social elements like societal influences or physical resources in the environment
"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 biobehavioural health in Pennsylvania State University
Owing to the significant volatility of Po and Pb in aerosol particles, both radionuclides are present in mainstream cigarette smoke 2,4,5,7,8,9
You can read more at the Cancer Research UK website
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