Cellular phones are taking ever increasing part in our lives, and I keep hearing people saying they are harmful to our health.
Are there any scientific researches so far proving or disproving those claims?
I found couple of semi-scientific articles:
Is there any link between cellphones and cancer? which says:
The possible connection between cellphones and cancer is controversial. Many years' worth of studies on cellphones and cancer have yielded conflicting results
In one study that followed more than 420,000 cellphone users over a 20-year period, researchers found no evidence of a link between cellphones and brain tumors
Another recent study suggested a possible increased risk of glioma — a specific type of brain tumor — for the heaviest cellphone users, but no increase in brain tumor risk overall.
Long-term use of both mobile and cordless phones is associated with an increased risk for glioma, the most common type of brain tumor, the latest research on the subject concludes.
The new study shows that the risk for glioma was tripled among those using a wireless phone for more than 25 years and that the risk was also greater for those who had started using mobile or cordless phones before age 20 years.
Though the second appears to conclude direct health risk, I'm pretty sure it's not yet any hard proof otherwise we would have seen huge lawsuits being filed all over the place.
If really harmful, what factors are in place e.g. cellular phone model, signal strength, etc?