its simple, you take to knives place them over or on the stover burner, turn it on, it makes the knives red hot, you then take some weed and put in on the one knife and press it to the other hot knife, it makes then it makes smoke just like smoking out of w\e. you can take a bottle and cut the bottom off and put the knives under and inhale threw the top of the bottle.. better yet heres a vid lol
http://www.waytoomany.com/vids/weed/knife_hit.php