I'm replacing a light switch with a smart switch that requires a neutral wire. When I removed the existing light switch, I noticed there is a white wire running through the box. Assuming this is the neutral wire, can I cut that, splice another wire in, cap it, and use for my smart switch?
There is a GFCI switch about 6 inches away. Could that white wire be going to the GFCI switch? If so, can I still use it?
Here's a picture of it. The white wire is in the box. Can I use that wire if it is indeed the neutral?
Close up images of inside of box: