I think it goes something like you get two knives. You place a little herb on one knife, and heat the other. When the heated knife is red, you press it to the unheated one with the herb. The heat is supposed to 'vaporize' the herb without burning it and resulting in a more intense high.

I dunno, I tried it once I all I got was a broken mason jar, a house that reeked of herb, and this t-shirt.
Big Calhoun Reviewed by Big Calhoun on . no more hot knives This is for anybody out there who has smoked hot knives before, im not really sure if its happened to anyone else or not. I was chillin at my buddys the other day and we were cookin up some hot knives to smoke some crystal THC when I took this giant hit and I lost control of my body. I started shaking uncontrollably and when I went to grab onto the fridge to hold me up I went right on my ass. I felt like a mini seizure. Anyway ive done them tons of times before but I say fuck hot knives now. Rating: 5