hi
yes, I can understand the symptoms you are experiencing. I too, on days when my neuropathy have caused severe perasthesia in my arms and hands, my arms and hands ends up with weaknes, spasm and tremors causing similar experience. Sometimes I am not able to write very well.
Sometimes, I have to masage my arms, just to feel they are there, and to kind of stretch the spasm out of my muscles.
And, yes, I think smoking cigaretts could make the situation worse. Nicotine is a stimulant. But I guess, it depends on how much nicotine.

Synnove