I read before that the fine powder that collects at the bottom of the grinder is very strong. Tried once to mix it into a joint but didn't feel anything (I smoke pure herb, no tobacco).

So how do you use it??

 

You only get that from a two-stage metal grinder. I just use the cheap single-stage 20 Baht plastic grinders from Sedina which provides the perfect grind for any type of use and it never gives you any of that powder. The powder is good for vaporizers though if mixed together with about 1/3 of regularly ground flower.