AFAIK it's the speed of the effect that is the dominant cause of addiction in this class of drugs, the drug has to outrun counter effects in the brain. Modafini

AFAIK it's the speed of the effect that is the dominant cause of addiction in this class of drugs, the drug has to outrun counter effects in the brain. Modafinil is slow onset and long lasting. It's also a weaker ligand so the body/brain can still overcome the effect so if you don't allow your body to rest modafinil won't be able to keep you awake. I've had to go cold turkey a few times and it was rather mild.