The State Tax Commissioner shall refuse to issue a license if, upon investigation, he or she finds that the applicant is unfit to engage in the business or has had a license previously revoked, or that the business is to be conducted on or immediately adjoining what is considered by him or her to be unsuitable premises, or that any other good reason exists within the meaning of the law: Provided, That the commissioner shall apply § 21-1-6 of this code when determining to refuse a license.