CD79A and nicotine dependence: As shown in Figure S10, MetaboAnalyst 4.0 indicated that 55 endogenous metabolites‐related metabolic pathways were GABAergic synapse, intestinal immune network for IgA production, glutamatergic synapse, small cell lung cancer, glutathione metabolism, nicotine addiction, African trypanosomiasis, gastric cancer, Th17 cell differentiation, alanine, aspartate and glutamate metabolism, d‐glutamine and d‐glutamate metabolism, and ferroptosis.