While cigar cutters are generally permitted, we recommend that you pack them in your checked baggage. TSA officers have the discretion to prohibit any item through the screening checkpoint if they believe it poses a security threat.
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Alcohol and tobacco: Each traveler over 21 years of age may import up to one liter of alcoholic beverage and either 200 cigarettes, 50 cigars or two kilograms of smoking tobacco for personal use. Cigars may not be of Cuban origin. beverages, perfumes containing alcohol with a retail value of more than $5 or cigarettes.
Tools 7 inches or shorter (measured from end to end when assembled) may be allowed in carry-on baggage. Power tools and all tools longer than 7 inches (measured from end to end when assembled) are prohibited in carry-on baggage; these items must be packed in your checked bags.
Don't let cigars roll around in a suitcase with extra space. If you plan to smoke the cigars within a few days, they should stay in good shape if you put them in a Ziplock bag then store them in a firm container. If your trip will last more than a few days, pack your cigars in a travel humidor.
Please, note that following the UK governmental guidelines it is essential to declare knives in checked luggage as well as in hand luggage. It will ensure the security of the flight and will help travellers avoid paying any fine.