| nAChRs | nicotinic acetylcholine receptors |
| CHRNs | nicotinic cholinergic receptor genes |
| ND | nicotine dependence |
| CPD | cigarettes smoked per day |
| FTND | Fagerstrom Test for Nicotine Dependence |
| ncRNAs | non-coding RNAs |
| LncRNAs | long non-coding RNAs |
| NAc | nucleus accumbens |
| VTA | ventral tegmental area |
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