CHRNB3 (Cholinergic Receptor Nicotinic Beta 3 Subunit): CHRNB3 is another subunit of the nicotinic acetylcholine receptor, and like CHRNA4, is involved in cholinergic neurotransmission. Genetic variations in CHRNB3 are associated with nicotine dependence and related behavioral traits, highlighting its role in the addictive properties of nicotine and potential influence on neural circuitry involved in addiction....