The World Health Organization announced Tuesday that cell phone use may cause cancer and carries carcinogenic hazard such as lead, engine exhaust and chloroform.

Though the WHO had assured consumers that no adverse health effects had been established, it found enough evidence to categorize the radiation exposure to the cell phone as possibly carcinogenic to humans, which could cause a glioma and acoustic neuroma brain cancer.

People who used cell phones, an average of 30 minutes per day over 10 years, had a 40 percent higher risk for a rare brain tumor called a glioma, the WHO cited based on a multi-country study.

On top of increased risk of cancer and tumors, excessive cell phone use could also be linked to other effects like cognitive memory function.

The European Environmental Agency said that cell phones could be as big a public health risk as smoking, asbestos and leaded gasoline.

As children’s lifetime exposure to cell phone RFs (radiofrequencies) today will likely be greater considering early start of cell phone use, the chances that a child could develop harmful health effects from using a cell phone for a long time may be greater. Therefore, it is best for children to avoid using cell phones.

Along the same line, public health experts, scientists, and many government agencies have made recommendations for cell phone users to aim towards lower radiation exposure.

Here are 10 smart cell phone use tips: