I believe I have a better ability to scrutinize my internal states. Like, when consuming alcohol, marijuana, or caffeine, more often than not I notice my subjective experience changing, i.e., I feel drunk/high/whatever. However, this might only be the case when I've taken greater, or stronger, doses of a given drug. If that is the case, it wouldn't be helpful. Perhaps if I have a history of needing to consume more of a drug for me to notice its affects, that could be net harmful, because I could be tempted to consume enough nicotine for me to notice its affects. By the time I've done that, it could already be that I've consumed too much. I imagine that would be bad for me because I might be more likely to develop, or experience, dependency effects, nausea, and other ill side effects of nicotine use, at higher doses.

I'll keep that in mind if I elect to trial the use of some form of nicotine.