OFAC FAQ #719 · Cuba Sanctions
Can I purchase Cuban-origin cigars and/or Cuban-origin rum or other alcohol while traveling in Cuba?
OFAC's answer
Persons authorized to travel to Cuba may purchase alcohol and tobacco products while in Cuba for personal consumption in Cuba. Please note that effective September 24, 2020, authorized travelers may no longer return to the United States with alcohol and/or tobacco products acquired in Cuba as accompanied baggage for personal use.