18.
of Revised Statutes of Missouri: "No person less than eighteen years of age shall purchase, attempt to purchase or possess cigarettes or other tobacco products unless such person is an employee of a seller of cigarettes or tobacco products and is in such possession to effect a sale in the course of employment,..."
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Found the answer to my own question. You must be 18 years or older to purchase tobacco products.
18 for a Title I long gun, 21 for a handgun or Title II firearm (any type which requires an NFA permit to purchase), the same as it in the rest of the country, in accordance with federal law.