You're in rehab for WEED?! You ever suck cock for weed?! No freaking way. Weed has some withdrawal symptoms sure, we call it 'jonesing' and it sucks a tiny bit. To compare it to dope sickness, opiate withdrawal is frankly insulting to those who have actually gone thru a real withdrawal. There are some drugs that have serious effects when stopped. Alcoholics can actually die from just stopping cold turkey. Caffeine was mentioned here and is a real bitch to come off of. Cigarettes are pretty tough. Opiate withdrawal kicks all of these in the nuts (except alcohol cuz that shit just kills!) MJ is actually very easy to let go when you have to, and pretty easy to pick back up. Try going on a 2 week holiday somewhere that has no dope. For a day or two you might jones a bit but after a few days you won't even think about it. Opiates day 1 you'll survive, day 2 you'll be shitting and jerking your body around like you have the fever/chills. Day three isn't any better, it's like being horribly sick. By the time day 7 is around you will not even care that you were on a holiday. These just don't even begin to compare.