ABCB1 and nicotine dependence: In that study, we reported that genetic variants of the drug transporter ABCB1 and a particular haplotype (1236TT-2677TT-3435TT) were significantly associated with non-smoking status, while no other associations with genetic variants of ABCB1 or CYP2A6, CYP2B6 with nicotine addiction was found (Muderrisoglu et al., 2020).