Although smoking is highly addictive and should never be started just because you feel like it enables you to learn something you are not particularly interested in Heishman et al. (2010) note that:
The significant effects of nicotine on motor abilities, attention, and memory likely represent true performance enhancement because they are not confounded by withdrawal relief. The beneficial cognitive effects of nicotine have implications for initiation of smoking and maintenance of tobacco dependence.
Note that tobacco smoking is not only addictive because of nicotine, but also because tobacco smoke contains potent MAO inhibitors which are speculated to potentiate the effects of nicotine. Berlin & Anthenelli (2001) note that:
We examine the hypothesis that chronic habitual smoking can be
better understood in the context of two pharmacological factors : nicotine and reduced MAO activity. We
speculate that MAO inhibition by compounds found in either tobacco or tobacco smoke can potentiate
Thus if you want to try nicotine your last choice should be smoking. There is snus or buy nicotine gum. Also consider talking to a professional so (s)he can recommend medication like methylphenidad or similar medication.
Let me give you another suggestion to start micro-dosing caffeine (-powder). Sholey et al. (2008) note that:
Cognitive performance, mood, autonomic activity and salivary caffeine were assessed pre-dose and at 1, 3, 6 and 9 h post-dose. Compared with placebo, performance was impaired by 2.5 mg, whilst 5 mg had negative effects on mood and mixed effects on performance and 10 mg improved performance.
Also note that what you describe in the first paragraph is very likely to happen: You will find it increasingly harder to study a subject you do not particularly like without the help of chemical helpers. This does not necessarily have to be detrimental. The very prolific mathematician Erdös used amphetamines for a significant proportion of his life. Just be warned that smoking tobacco might be the most detrimental chemical aid...