Del. Code tit. 30, § 5319

If in the judgment of the Department the collection of the excise tax imposed in § 5305 of this title upon tobacco products other than cigarettes will be more efficiently and economically collected by a system which does not employ tax stamps as authorized by this chapter, such alternative system may be utilized by the Department at its discretion. The alternative system may include self-assessment by any wholesale or retail tobacco products dealer on forms supplied by the Department. If instituted, the alternative collection system shall be set forth in the rules and regulations of the Department, which shall be distributed to all affected dealers at least 90 days in advance of the effective date of such rules and regulations.