This was about 5 years ago.
Recently, I’ve started using nicotine gum to increase focus while working. I usually use 1 mg, maximum 4 times a day. I typically begin taking it in the afternoon, my morning work sessions are usually nicotine-free. I have been using it on most days for about 3 months.
I have zero desire to smoke or vape. On days when I am not taking it, I don’t have a strong craving for the gum.
I’ve also quit caffeine a few days ago, with the intention to not use it for at least 3 months. I find that even low amounts of tea increases my anxiety to the point that it becomes difficult to focus. I’ve been very productive since I stopped caffeine. Mild withdrawal effects in the form of physical tiredness, but I am fine with the tradeoff for less anxiety.
I might have developed some level of physical dependency to nicotine, I’ll see it once I’ll do an extended break. For now, it’s the only dopamine-increasing substance I consume, and I’m fine with it.