What is Gaslighting you might ask, it is a form of psychological manipulation.
Gaslighting can have a damaging effects on your mental health. Who Gaslights? Narcissist, Psychopaths, the main reason why they Gaslight is to destabilise and delegitimise their victim or target. My answer on Quora is straight to the point and should help you see how it can affect you mentally.
Answer to How dangerous is gaslighting for mental health? by Amy Farley https://www.quora.com/How-dangerous-is-gaslighting-for-mental-health/answer/Amy-Farley-32?ch=99&share=522a3705&srid=Vmmly