I'm a recovering weed addict. Smoked a good amount of synthetic weed too, mainly when I didn't have access to the real stuff. In my experience, both are bad. What I will say though, is that when I was smoking synthetic, I felt the compulsion to smoke over and over throughout the day more than normal weed. I can't tell you how quitting synthetic specifically is as I hadn't smoked it in a couple months before I quit weed. I can imagine the two being similar though. I didn't have much appetite for a few weeks quitting weed too, which makes me think this. You should definitely check out the Marijuana Addiction forum. There's a lot of great stuff over there for dealing with this kind of thing. Stay strong, it will get better. It will likely be a rollercoaster of emotions for a long time, but it WILL get better.