Over 420,000 cell phone users were closely monitored by scientists in Denmark from the Cancer Epidemiology in Copenhagen to study the harmful effects of cell phone usage. Almost half a million, were regular users of cell phones for over a decade. Few were using cell phones for almost 2 decades.
It has been proven by scientists in previous studies that the electromagnetic waves emitted by cell phones, are capable of penetrating the outer edge of the human brain; several debates have ensued incriminating that this increases the chances of umpteen cancerous changes in the head and neck. However, no concrete evidence was found to support this theory.
The current Danish study categorically says that no long term or short term ill effects could be associated with the regular use of cell phones. The study ruled out the possibility of leukemias, and cancers affecting salivary gland and brain tumors due to regular use of cell phones.