@ammogan
I suggest you start by re-thinking your thread title.
Change it to:
"
I'm physically addicted to nicotine via smoking. It is seriously damaging my health. Please help."
Then the first part can point out that you use the smoking as a stim as well, which makes it (a) even harder to stop, and (b) relevant here.
The re-written heading is a reflection of what seems to be a fundamental fact about addictions: people can't deal with them until they accept that
the addiction itself has become the problem.
I'm sure all the other stuff - stimming, self-medicating, discomfort when interruption drug intake, difficulty finding "bridging" substitute activities for your associated habits -is true. But they are contributing factors -
they are not the core of your major problem.
BTW - I know that my being direct like this may induce "mental pushback". I said all this knowing that, so I accept that you may react negatively, and will take it without responding
Also I won't keep going if you don't engage with me. Talking with addicts in denial is pointless.
This can only be interesting for others (for me anyway) if you're trying to change.
BTW I don't have any moral objection to your behavior. Along with being legal, heavy smoking is so bad for peoples health that they cost societies like mine, with subsidized/free healthcare, significantly less than healthy people do, because they die so much earlier (and faster). So on balance you're probably not harming society.
As far as I know the exit process is unusually unpleasant though. Even switching to nicotine delivery via some other path than the lungs would help a lot with that.