I've never had a strong physical addiction to opiates/opioids but I unfortunately know all too well about the psychological side of it. There are a lot of words that come to mind when it comes to opioid addiction and none of them are positive. If you're thinking about becoming a recreational opioid user I strongly recommend that you read some of the many posts written by members who are going through or have been through opiate addiction, and see if you can handle that. I'm not going to lie an opiate high is (at least in my opinion) one of the best feelings in the world, why else would so many addicts risk losing everything they own not to mention their lives constantly chasing it?
Sorry about all of that. Now back to the topic... If I had to choose just one word I think it would be Consuming