Can I reset the SMC on an M-series MacBook Air?

No, you can’t reset the SMC on an M-series MacBook Air because there’s no SMC to reset — Apple moved that functionality into the system firmware, which self-manages. Instead, try a full shutdown by holding the power button until the screen goes black, wait 30 seconds, then boot up. If issues persist, check Activity Monitor for runaway processes or reset NVRAM by shutting down and holding the power button for 10 seconds while booting. If problems continue, it’s likely a hardware or software bug needing a real fix.