Devices like phones and laptops cannot kill you through diseases like cancer, but there are some things to not about it.

Sources:

Video of Wrongs: https://www.youtube.com/watch?v=xc24JIMI6MI

Testicular Damage: https://lifehacker.com/using-your-laptop-in-your-lap-isnt-really-a-health-risk-1825602086

Phones and Cancer: https://www.cancer.org/cancer/cancer-causes/radiation-exposure/cellular-phones.html

Electromagnetic Spectrum: https://en.es-static.us/upl/2012/05/em_spectrum.png

Laptops and Radiation: https://wtamu.edu/~cbaird/sq/2014/12/04/why-doesnt-my-laptop-emit-radiation/

LED Light Fittings and Radiation: https://www.jpost.com/Jpost-Tech/Environment/Once-and-for-all-Is-it-safe-to-use-LED-lighting-534714 and https://www.scientificamerican.com/article/led-lightbulb-concerns/