Yes I do it currently, it's one of the only things that's helped my depression even a little. Unfortunately for me the effect is modest and only lasts a few days, but it's better than nothing. I don't terribly love the effects despite liking most other drugs, so chance of addiction for me is about 0.
I agree with other posters that 200+ mg every three days is excessive for most people, but I don't think it's dangerous. Dissociative addiction will mess you up though, it's just that you'd be doing far more than that as an addict.
I don't know anything about your alluded to substance use issues, it probably depends on your DOC whether I'd recommend risking it.
That reminds me, remember Sarah Silverman's Oscar worthy performance when they go back to the future past? She acts almost entirely with her lower lip, presumably as some kind of flex