A: The variant NC_000020.11:g.63350636A>G in gene CHRNA4 is classified as 'not_provided' for Tobacco_use_disorder. Molecular consequence: SO:0001583: missense_variant,SO:0001619: non-coding_transcript_variant. Variant type: single_nucleotide_variant. Disease database links: MedGen:C0040336. Review status: no classification provided.