I cold smoked some sea salt in my MES 40 using an AMNPS. Threw some coarse sea salt on one of the screen trays I made and let it go until the AMNPS burned out. Probably around 15 hours. Put it on at 11am and it was still smoking when I stumbled in at 1am. Thanks to the best DD ever... my wife. Mixed in a tiny bit of uncooked for color contrast in the grinder. It really took the smoke well.