These exemptions are offered to travelers who spend at least 72 hours in the United States and who have not claimed them within the preceding 6 months. Customs Every visitor 21 years of age or older may bring in, free of duty, the following: (1) 1 liter of alcohol as a gift or for personal use (2) 200 cigarettes, 100 cigars (but not from Cuba), or 3 pounds of smoking tobacco and (3) $100 worth of gifts.