Abstract: A method and system for optimizing product selection based on chemical attribute declustering. The system receives a product selection from a user, receives preference feedback data from the user including at least one physical attribute or medicinal effect, such as personal feelings or a calming effect for the product selection, and processes the preference feedback data, which may include a geometric location, to generate a three-dimensional representation including indicia of the preference feedback data to assist the user in product selection. The three-dimensional representation has at least one area correlating to the physical or medicinal effects. The product selection can be a food product selection, an herbal product, a drug product, or a cannabis product. A vending machine can be provided to formulate a chemical composition from a number of ingredients which are blended immediately for distribution to a patient or customer.