TheInternet said:
Lance and company celebrate as Sheryl Crow shoots her credibility dead with that proclamation. Whatever Crow may have told the USADA or anybody else is now easily defended as the rantings of a lunatic who thinks cell phones not only cause cancer, but caused her cancer.
I LOVE Sheryl's credibility!

Sheryl can defend her statement on several levels.
That LA's credibility is not yet dead to a large minority of the general populous speaks volumes. Sheryl's credibility is excellent in light of the previous sentence.
To accept that her actions may have contributed to her illness seems realistic and empowering. That the action was "use of a mobile" seems ok as Sheryl appears to suggest a possibility rather than an overwhelming likelihood.
Her comment may simply be defended by stating that there is the possibility that mobile phone use contributes to cancer inception or growth rate and that in turn may have contributed to her cancer. There is currently no evidence "proving" cell phone use does not contribute to the incidence of cancer. As we all know "proving" the negative is analogous to passing a camel thru' the eye of a needle....
Furthermore Sheryl was likely (I do not know) an early adopter of cell phone use. There is the possibility that early cell phones had greater radiation1 outputs.
1 non-ionizing radiation
http://www.cancer.gov/cancertopics/factsheet/Risk/cellphoneshttp://
"In one type of study, called a case-control study, cell phone use is compared between people with these types of tumors and people without them. In another type of study, called a cohort study, a large group of people is followed over time and the rate of these tumors in people who did and didn’t use cell phones is compared. Cancer incidence data can also be analyzed over time to see if the rates of cancer changed in large populations during the time that cell phone use increased dramatically. The results of these studies have generally not provided clear evidence of a relationship between cell phone use and cancer,
but there have been some statistically significant findings in certain subgroups of people ."
....
"Changing technology and methods of use.
Older studies evaluated radiofrequency energy exposure from analog cell phones. However, most cell phones today use digital technology, which operates at a different frequency and a lower power level than analog phones. Digital cell phones have been in use for more than a decade in the United States, and cellular technology continues to change ..."