I responded on the other thread, so please read that. Is there a difference between a substance abuser and a full blown addict? NO. There are two medical classifications: Substance Abuse and Substance Dependence. And "substance" can include anything - legal or illegal. Alcohol, caffeine, nicotene, opiates, etc, etc., etc. These are medical diagnostic categories and your husband is not simply an abuser, but is substance dependent. Actually, may be dependent on multiple substances (called polysubstance abuse or dependence). None of this really matter to you. You're splitting hairs to try to avoid the truth. And I have to say you need while I don't mind giving you some information here, this is a website for those of us struggling with chronic pain, and you can come here for info. and support on that area, but you ALSO need to be involved in some addiction programs and websites for family members.
Has your husband made any progress? Well, ONLY if he gets back into a treatment program. There are slips and there are relapses. As I've said both are common with addiction, but it's what you do with it - and I mean YOU as well as your husband - that matters.
Suppose you were trying to lose weight. And one night you binge and eat a whole chocolate cake. That's a "slip". You can wake up the next morning and choose to tell yourself that you slipped, but you really want to be healthy and so you're going to return to your regular eating plan. That's a slip. But you can also wake up and tell yourself that nothing matters anymore, you ate that cake and that means all is lost and you might as well just return to your old, unhealthy eating habits, and you go eat more chocolate cake. That's a relapse. Because you've fallen back into old thinking patterns, behavior patterns, etc.
So an addict that slips and gets back into his/her treatment program is still making progress. But your husband's continuing snoritng, using meds at night, ANY kind of "odd" behavior with drugs is a relapse. You need to stop believing him because if you don't he's going to eventually die. Addictions are treatable, but if untreated they are fatal. That means if someone doesn't kill themself (or heaven forbid someone else) in a car accident, or end up in jail (in your husband's case could be from gambling in combination with drugs, or buying drugs on the street, etc, etc, etc,) .... if they live long enough beyond catastrophic events addiction is fatal.