Firstly, I wouldn't read up too much on the effects/side effects of the drugs you're taking. It took me a long time to figure out that if I do this too much, I start experiencing the adverse effects i read about. This is especially true for those with anxiety. If that is what your doctor recommends, I would give it a shot. That said, I'll gloss over some of the literature.
If you start to feel really wound up and have significant tremors, please contact your doctor promptly. I say this because pregabalin has a ton of use in psychiatry, but it's far enough away from the actions of benzos that there might be some turbulence. For instance, I believe it's useful in mild to moderate alcohol withdrawal, but not severe alcohol withdrawal. Benzos are the go-to for sever alcohol withdrawal. That means to me that pregabalin works (in decent part) separately from benzos.
As for cigarettes, the basic idea is that they don't make people more mentally healthy in the end. Nicotine by itself (or perhaps even in smokeless tobacco) may be a different story. There are certainly accessible studies out there that find smoking to make people more depressed and anxious.
Benzos are strangely prescribed in US a lot for the long-term. Generally speaking, Europe gives them out for only several weeks. As for long-term efficacy, I'd ask your doctor.
It's a big step to stop taking a benzo at any dose that you've been on for a while.
Please stay in close contact with your doctor. And again, reading too much about the drugs one takes usually doesn't end up well. My advice would be to focus on developing positive coping habits and let the doctor steer the medication ship.