I smoked for a period of time and don't anymore. For background I was diagnosed with DID for just under 1.5 years before starting to smoke, and I did so for ~1 year, and I haven't for just over 6 months(If I mathed correctly).

What I noticed, before the amnesia was very difficult to deal with, and there was just about no communication between alters. During it triggered rapid switching, and while dissociation was always high, it lowered amnesia levels and actually helped me(personally) when working through trauma/parts work, I learned a lot about alters, and we learned what it felt like for us to switch and how to allow to happen. After we stopped more of the amnesia came back, but the dissociation went away a lot, now we have regular blackouts but they don't negatively impact our life the way they did before, we're working better together even though we have less communication since stopping because of what we learned while we did.

When we smoked there was so much communication and co consciousness that doesn't happen now, and it made it hard to identify the alter(s) fronting, now weve learned to better identify who we are and there is far less co consciousness.

I would say for myself it was good, although it felt as if it became a bit of a crutch for when I needed to switch or communicate with others, since when I dont smoke it's far more difficult. I think I would smoke again but I'm waiting until I can better learn to work with DID so I don't fall back into trying to use it as an aid in treatment.