I have a mild to moderate "intention tremor" in my left thumb. It is only noticable when I hold a tool or instrument such as a pair of tweezers or a screwdriver and attempt a fine motor activity. I am right hand dominant so it doesn't affect me with common everyday tasks. However, I assist surgeons in the operating room, and at times I need both hands to function equally. I have in most cases found a work around to my problem.
Before I quit smoking (one pack a day for 30 years) a year ago, I attended a medical conference and one of the speakers was a neurologist. I was able to speak with him one-on-one after his talk, and showed him my tremor. He instantly recognized the "clubbing" of the ends of my fingers and asked if I was a smoker. He said that the condition I had was hereditary and asked if anyone else in my family had it. He also said that smoking made the condition worse (the tremor and the clubbing). I honestly forget if he said this was Buerger's or something else.
Since I've been vaping for a year, and have reduced my nicotine consumption from 24mg down to 12mg, I've noticed that the tremor has become less severe, but it is still there. Even if I someday am able to get down to 0mg nic it may still be present to some degree.