What it is, is that you need to know your limit. Don't get worried and not smoke it no more...not unless you really feel you shouldn't. Before when I started to smoke weed, I use to smoke way more then I should have. I havn't gotten the greens or nothing from it but I was shaking like crazy. I was sitting in a chair and my best friend was across the table and I was after doing some hot knifes, and it hit me fast and hard. Everyone was just looking at me, watching my legs and arms, everything shake. I thought it was kidda cool myself. I got such a kick out of it...I have never gotten like that since that day. I shake a little still but I'm a shaky person.