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). This evidence concerns the gene CYP2B6 and nicotine dependence.