After a dabble of mine recently turned into a 5 day binge, I am pretty sure that you really can't do it once in a while, it really is all or nothing, unlike cocaine... which sucks.
Even if someone is only able to dabble again and only keep it at that, I still think that might only be possible after a couple months of not doing it, and only after one can truly believe that they don't need it in their life. Being addicted can definitely make you do dumb things.
I'm looking back and it definetely sucks where I am. I'm not going to school and moved back in with my parents. If I'm gonna do it again I definitely need to get my shit straight and moved back in a new apartment with a job and/or going to school. I might perhaps do it on a quiet evening when I am feeling accomplished, but definitely only after my priorities are in order.