A method of obtaining a risk score for evaluating stratification of a plurality of ranges for a genetic addiction risk comprising the steps of: (a) performing an allelic analysis on a biological sample obtained from a subject to determine the presence of each allele in a plurality of pre-determined alleles, wherein (i) each of the alleles in the plurality of pre-determined alleles is associated with a gene in a plurality of pre-determined genes, (ii) there are at least ten genes in the plurality of pre-determined genes, and (iii) there is at least one allele for each of the genes in the plurality of pre-determined genes, wherein the plurality of pre-determined alleles comprise: (a) allele G of gene DRD1; (b) allele A1 of gene DRD2; (c) allele C of gene DRD3; (d) allele C of gene DRD4; (e) allele 9R of gene DAT1; (f) allele 7-11R of gene DRD4; (g) allele S or L of gene HTTLPR; (h) allele 4R of gene MAOA; (i) allele G of gene COMT; (j) allele G of gene OPRM1; and (k) allele 181 of gene GABRB3, wherein the alleles are listed in Table 3; (b) assigning a count for each of the alleles in the plurality of pre-determined alleles that was present in the biological sample; and (c) determining a risk score based upon the count, wherein the stratification of the plurality of ranges identifies a severity of the genetic addiction risk. (a) performing an allelic analysis on a biological sample obtained from a subject to determine the presence of each allele in a plurality of pre-determined alleles, wherein (i) each of the alleles in the plurality of pre-determined alleles is associated with a gene in a plurality of pre-determined genes, (ii) there are at least ten genes in the plurality of pre-determined genes, and (iii) there is at least one allele for each of the genes in the plurality of pre-determined genes, wherein the plurality of pre-determined alleles comprise: (a) allele G of gene DRD1; (b) allele A1 of gene DRD2; (c) allele C of gene DRD3; (d) allele C of gene DRD4; (e) allele 9R of gene DAT1; (f) allele 7-11R of gene DRD4; (g) allele S or L of gene HTTLPR; (h) allele 4R of gene MAOA; (i) allele G of gene COMT; (j) allele G of gene OPRM1; and (k) allele 181 of gene GABRB3, wherein the alleles are listed in Table 3; (i) each of the alleles in the plurality of pre-determined alleles is associated with a gene in a plurality of pre-determined genes, (ii) there are at least ten genes in the plurality of pre-determined genes, and (iii) there is at least one allele for each of the genes in the plurality of pre-determined genes, wherein the plurality of pre-determined alleles comprise: (a) allele G of gene DRD1; (b) allele A1 of gene DRD2; (c) allele C of gene DRD3; (d) allele C of gene DRD4; (e) allele 9R of gene DAT1; (f) allele 7-11R of gene DRD4; (g) allele S or L of gene HTTLPR; (h) allele 4R of gene MAOA; (i) allele G of gene COMT; (j) allele G of gene OPRM1; and (k) allele 181 of gene GABRB3, wherein the alleles are listed in Table 3; (a) allele G of gene DRD1; (b) allele A1 of gene DRD2; (c) allele C of gene DRD3; (d) allele C of gene DRD4; (e) allele 9R of gene DAT1; (f) allele 7-11R of gene DRD4; (g) allele S or L of gene HTTLPR; (h) allele 4R of gene MAOA; (i) allele G of gene COMT; (j) allele G of gene OPRM1; and (k) allele 181 of gene GABRB3, wherein the alleles are listed in Table 3; (b) assigning a count for each of the alleles in the plurality of pre-determined alleles that was present in the biological sample; and (c) determining a risk score based upon the count, wherein the stratification of the plurality of ranges identifies a severity of the genetic addiction risk. <EOS>