12 guage and 14 guage wire at switch box

Lynnwood, WA(Zone 7a)

Where a wall heater was removed there is a switch that now goes nowhere. At one time it controlled the power to the heater. A gas fireplace has replaced the heater. The switch has 12 guage wire coming into it on one side of the box and 14 guage going out to where the heater used to be wired in. What is the reason for 2 sizes of wire?
Thanks for sharing your knowledge

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