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.
Another paper about microdosing caffeine reports:
This study measured the effects of 0, 12.5, 25, 50 and
100 mg caffeine on cognitive performance, mood and
thirst in adults with low and moderate to high habitual
caffeine intakes.Effects on performance and mood confirmed a
psychostimulant action of caffeine. All doses of caffeine
significantly affected cognitive performance, and the
dose-response relationships for these effects were rather
Rogers & Smit (2000): Effects of low doses of caffeine on cognitive performance, mood
and thirst in low and higher caffeine consumers
The effects of caffeine can be enhanced by L-theanin as found in tea (camellia sinensis). A meta-analysis of the combined effects of caffeine and L-theanin notes that:
Evidence of moderate eﬀect sizes in favor of combined caﬀeine and
L-theanine in the ﬁrst 2 hours postdose were found for outcome measures
Bond-Lader alertness, attentional switching accuracy, and, to a lesser extent, some
unisensory and multisensory attentional outcomes. Moderator analysis of caﬀeine
and L-theanine doses revealed trends toward greater change in eﬀect size for
caﬀeine dose than for L-theanine dose, particularly during the ﬁrst hour post dose. Camfield et al. 2014
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...