Current health risks can be categorized in two parts:
Physical:
Radiation emitted from mobile devices can give you headache and restlessness. It is also accused of giving cancer however studies are being conducted to reach a final verdict.
Blue light from screen can mess with your sleeping pattern.
Addiction of mobile means less physical activity that leads to health issues like diabetes.
Focusing at short distance for longer time means more stress on eyes.
Mental:
Dependency on mobile apps for simple used lick calculation leads to less efficient brain.
Poor memory because mobile remembers every thing
Addiction to games or pornography
One can be target of cyber bullying