pbuilder, if you used the search function you could find this answer 10X over in the time it takes to get 1 reply. I see you start a lot of threads on stuff that has already been covered a lot, so I highly recommend familiarizing yourself with that search. Here is some of the info you would have come across by searching to answer the same question you asked here;
Nodding- what is it and how is it achieved?
What's nodding?
Was I nodding?
What is nodding?
What is nodding? (BDD)
And that's just to name a few....
Nodding- what is it and how is it achieved?
What's nodding?
Was I nodding?
What is nodding?
What is nodding? (BDD)
And that's just to name a few....

). I still didn't feel much euphoria from it, much like I don't feel euphoria from it when I take it orally, and I experienced a rush both times but didn't like it. I also did it a few months later once with pills, and had the same results.