effects of smart phones

source

these days most of the people uses smart phones daily and the smart phone is not bad there is so many good things in it and it is useful but it have some bad effects if you didnt use it properly. for example if you use it for a long time your eyes will be weak and also it will make you lazy if you keep using it for the whole day and there is so many effects if you did not use it properly.

thank you
@o4wx