A quick scan of PubMed reveals an approximately equal number of studies that found associations at higher exposure durations and urged caution (use of hands free headsets) and those that found no significant increase in risk from exposures. Generally, it seems long term use does carry significant risk. I think its smart to be cautious.
here is a sampling. (Below) But the main point I am trying to make is that anything that is pro-oxidant likely has a potential under some conditions, of causing serious illness in some people in an additive manner. So many things we are exposed to deplete
glutathione, strong RF being one of them. So its wise to avoid them. Cancer is basically a disease that occurs when the body's first line repair mechanisms get used up, so its wise to try to avoid depleting them any more rapidly than necessary. Thats also why NAC (n-acetylcysteine) is a good thing to take.
1: Morgan LL, Miller AB, Sasco A, Davis DL. Mobile phone radiation causes brain
tumors and should be classified as a probable human carcinogen (2A) (review). Int
J Oncol. 2015 May;46(5):1865-71. doi: 10.3892/ijo.2015.2908. Review. PubMed PMID:
25738972.
2: Yoon S, Choi JW, Lee E, An H, Choi HD, Kim N. Mobile phone use and risk of
glioma: a case-control study in Korea for 2002-2007. Environ Health Toxicol. 2015
Dec 21;30:e2015015. doi: 10.5620/eht.e2015015. PubMed PMID: 26726040; PubMed
Central PMCID: PMC4872697.
3: Carlberg M, Hardell L. Decreased survival of glioma patients with astrocytoma
grade IV (glioblastoma multiforme) associated with long-term use of mobile and
cordless phones. Int J Environ Res Public Health. 2014 Oct 16;11(10):10790-805.
doi: 10.3390/ijerph111010790. PubMed PMID: 25325361; PubMed Central PMCID:
PMC4211006.
4: Vijayalaxmi, Prihoda TJ. Mobile phones, non-ionizing radiofrequency fields and
brain cancer: is there an adaptive response? Dose Response. 2014 Apr
22;12(3):509-14. doi: 10.2203/dose-response.14-012.Vijayalaxmi. PubMed PMID:
25249839; PubMed Central PMCID: PMC4146338.
5: Coureau G, Bouvier G, Lebailly P, Fabbro-Peray P, Gruber A, Leffondre K,
Guillamo JS, Loiseau H, Mathoulin-Pélissier S, Salamon R, Baldi I. Mobile phone
use and brain tumours in the CERENAT case-control study. Occup Environ Med. 2014
Jul;71(7):514-22. doi: 10.1136/oemed-2013-101754. PubMed PMID: 24816517.
6: Lee Titsworth W, Murad GJ, Hoh BL, Rahman M. Fighting fire with fire: the
revival of thermotherapy for gliomas. Anticancer Res. 2014 Feb;34(2):565-74.
Review. PubMed PMID: 24510985.
7: Mihailovi? G, Markovi? M, Zivkovi? N, Mihailovi? G, Markovi? M, Berisavac I,
Spai? M. [Epidemiological features of brain tumors]. Srp Arh Celok Lek. 2013
Nov-Dec;141(11-12):823-9. Serbian. PubMed PMID: 24502107.
8: Lagorio S, Röösli M. Mobile phone use and risk of intracranial tumors: a
consistency analysis. Bioelectromagnetics. 2014 Feb;35(2):79-90. doi:
10.1002/bem.21829. Review. PubMed PMID: 24375548.
9: Hardell L, Carlberg M, Söderqvist F, Mild KH. Case-control study of the
association between malignant brain tumours diagnosed between 2007 and 2009 and
mobile and cordless phone use. Int J Oncol. 2013 Dec;43(6):1833-45. doi:
10.3892/ijo.2013.2111. PubMed PMID: 24064953; PubMed Central PMCID: PMC3834325.
10: Hardell L, Carlberg M, Hansson Mild K. Use of mobile phones and cordless
phones is associated with increased risk for glioma and acoustic neuroma.
Pathophysiology. 2013 Apr;20(2):85-110. doi: 10.1016/j.pathophys.2012.11.001.
PubMed PMID: 23261330.
11: Grigor'ev IuG. [The probability of developing brain tumours among users of
cellular telephones (scientific information to the decision of the International
Agency for Research on Cancer (IARC) announced on May 31, 2011)]. Radiats Biol
Radioecol. 2011 Sep-Oct;51(5):633-8. Russian. PubMed PMID: 22279776.
12: L'Abbate N. [Motivation and significance of IARC classification for mobile
phone]. G Ital Med Lav Ergon. 2011 Jul-Sep;33(3 Suppl):384-7. Italian. PubMed
PMID: 23393882.
13: INTERPHONE Study Group.. Brain tumour risk in relation to mobile telephone
use: results of the INTERPHONE international case-control study. Int J Epidemiol.
2010 Jun;39(3):675-94. doi: 10.1093/ije/dyq079. Erratum in: Int J Epidemiol. 2012
Feb;41(1):328. Montestruq, L [corrected to Montestrucq, L]. PubMed PMID:
20483835.
14: Ahlbom A, Feychting M, Green A, Kheifets L, Savitz DA, Swerdlow AJ; ICNIRP
(International Commission for Non-Ionizing Radiation Protection) Standing
Committee on Epidemiology.. Epidemiologic evidence on mobile phones and tumor
risk: a review. Epidemiology. 2009 Sep;20(5):639-52. doi:
10.1097/EDE.0b013e3181b0927d. Review. PubMed PMID: 19593153.
15: Croft RJ, McKenzie RJ, Inyang I, Benke GP, Anderson V, Abramson MJ. Mobile
phones and brain tumours: a review of epidemiological research. Australas Phys
Eng Sci Med. 2008 Dec;31(4):255-67. Review. PubMed PMID: 19239052.
16: Hartikka H, Heinävaara S, Mäntylä R, Kähärä V, Kurttio P, Auvinen A. Mobile
phone use and location of glioma: a case-case analysis. Bioelectromagnetics. 2009
Apr;30(3):176-82. doi: 10.1002/bem.20471. PubMed PMID: 19142876.
17: Karipidis KK, Benke G, Sim MR, Kauppinen T, Giles G. Occupational exposure to
ionizing and non-ionizing radiation and risk of glioma. Occup Med (Lond). 2007
Oct;57(7):518-24. PubMed PMID: 17728306.
18: Hours M, Bernard M, Montestrucq L, Arslan M, Bergeret A, Deltour I, Cardis E.
[Cell Phones and Risk of brain and acoustic nerve tumours: the French INTERPHONE
case-control study]. Rev Epidemiol Sante Publique. 2007 Oct;55(5):321-32. French.
PubMed PMID: 17851009.
19: Takebayashi T, Varsier N, Kikuchi Y, Wake K, Taki M, Watanabe S, Akiba S,
Yamaguchi N. Mobile phone use, exposure to radiofrequency electromagnetic field,
and brain tumour: a case-control study. Br J Cancer. 2008 Feb 12;98(3):652-9.
doi: 10.1038/sj.bjc.6604214. PubMed PMID: 18256587; PubMed Central PMCID:
PMC2243154.
20: Schüz J, Böhler E, Schlehofer B, Berg G, Schlaefer K, Hettinger I,
Kunna-Grass K, Wahrendorf J, Blettner M. Radiofrequency electromagnetic fields
emitted from base stations of DECT cordless phones and the risk of glioma and
meningioma (Interphone Study Group, Germany). Radiat Res. 2006 Jul;166(1 Pt
1):116-9. PubMed PMID: 16808597.