One physical light switch to control a separate smart switch?

In SmartThings, any controlled device that talks to the hub can be used to trigger any other controlled device that talks to the hub. As @bholmes mentioned, the official SmartLighting feature is probably the easiest way to do this, and has the advantage of running locally if both devices are eligible to run locally.

So it can be a regular light switch, an inwall micro, or any of the devices on the buttons and remotes FAQ:

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