Some of these patients are smokers, heavily exposed second-hand smokers and those using nicotine for smoking cessation or pain relief.
Clinical and epidemiological studies suggest that first-hand or heavily exposed second-hand smokers have more progressive and metastatic cancers than that in non-smokers [2].
Our findings also warrant the mechanism for cancer patients who are smokers, heavily exposed second-hand smokers or nicotine users to develop the resistance to radiation therapy.
The results not only indicates the potentially important role of nicotine in facilitating the establishment of genetic instability to promote lung tumorigenesis, but also warrants a dismal prognosis for cancer patients who are smokers, heavily exposed second-hand smokers or nicotine users.
Active smokers had significantly lower PFOS concentrations than nonsmokers or second-hand smokers.
A positive relationship exists between years smoked and bone thinning and fractures, which is also observed in second-hand smokers.
During analysis, the number of active tobacco smokers was negligible (three participants only) while there were hundreds of passive or second-hand smokers.
Moreover, the prevailing health warnings in Laos only covers 30%% of the packet and may not be impressive or useful enough to remind people of the hazards of smoking, and that "cigarettes are harmful not only to smokers but also to second-hand smokers,".
Obese women had significantly lower PFOS and PFNA concentrations than other women; active smokers had significantly lower PFOS concentrations than nonsmokers or second-hand smokers; women with a high school education or below had significantly lower PFHxS concentrations than women having more than a high school education.
Since there is a lack of understanding about the underlying molecular mechanisms by which tobacco smoke promotes turmorigenesis in other organs of human body, rather than in the lung, nicotine has become a major object of investigation, because it exists in high concentrations in the blood stream of first-, heavy second-hand smokers and nicotine users [ 37- 39].
