just done my first nitrous hit .

Now you know why N2O is considered a "controlled dangerous substance", it's addictive. :)
True, i have a friend that bought a nitrous set up. He used to huff the nitrous from cans of whipped cream, which was expensive. I came by one day an he had a huge shiner on his eye, and the nitrous bottle was empty. He had done a huge hit, passed out and hit the door frame. I now own that kit.