First.. don't use Vodka. Use everclear.

Second, it's called a green dragon.

Third, THC is alcohol and fat soluable.. so with MJ soaked in everclear, the alcohol absorbs it then you get a drink that's alcohol with THC. It's great when you have like 2 shots mixed with Dr. Pepper.. I used to take that shit into movie theators all the time. It's good stuff. The best way to do it, it seems.. is to get the everclear, and put as many small stems and pieces of bud that you can in there.. and poke a hole or two in the top to release any gases.. then put the bottle in a black trash bag and just sit it up on your roof. The sun will heat it up b/c black attracts the most sun. That's pretty much it, good luck.