Even if the smoker did not quit nicotine completely, then at least they would be smoking flavored water vapor instead of the chemical equivalent to car exhaust
I took a look and found a box of Trinidad Viga for about US$168 for the box of 12

Categories New Items German WW2 Militaria Awards & Badges Iron Crosses War & Qualification Badges Infantry Assault Badges General Assault Badges Tank Assault Badges Wound Badges Luftwaffe Awards Kriegsmarine Awards Medals & Orders NSDAP, non-Combat Ribbon Bars & Ribbons Certificates & Docs Tins, Pins, Miniatures Headgear Visor Hats Field Caps NSDAP & non-Combat Other headgear Insignia, Accessories Steel Helmets Heer, Kriegsmarine Luftwaffe SS & Polizei Other Helmet parts Uniforms Heer Luftwaffe Kriegsmarine SS & Polizei NSDAP & non-Combat Pants & Breeches Boots & Shoes Parts & Buttons SS Items Headgear & Helmets Uniforms Insignia Field Gear Paper Items DogTags Other SS items Insignia Heer Luftwaffe Kriegsmarine SS & Polizei NSDAP & non-Combat Cufftitles & Armbands Buttons & Accessories Belts & Buckles Field Gear, Equipment Belts & Buckles Canteens & Mess Kits Gasmasks, Goggles, related Backpacks & Bags Pouches & Holsters Grenades & Ammo Related Straps, Slings & Loops Binoculars & Optics Other fieldgear Photos & Albums Albums & Sets Combat Photo Portrait Photo Paper Items Art & Culture Atlases, Maps DJ-HJ magazines Military Magazines Books, booklets, manuals Newspapers, magazines Leaflets Posters & Postcards Wehrpass, Soldbuch, Ausweise Dog Tags Personal Items Food Related Tobacco Related Miscellaneous Flags & Banners Russian WW2 Militaria Awards & Badges Headgear Steel Helmets Uniforms Tunics & Gymnasterkas Overcoats & Suites Boots & Shoes Trousers & Breeches Other uniforms Accessories Insignia Headgear Insignia Uniform Insignia Buttons & Accessories Field Gear Belts & Buckles Ammopouches & Holsters Gasmasks & Related Bags & Covers Canteens & Mess Kits Slings & Straps Binoculars & Optics Grenades & Ammo Related Other fieldgear Photos & Postcards IDs & Paper Items Paybooks & IDs Newspapers & Magazines Books & Manuals Leaflets Art & Posters Other documents Personal Items Other militaria Imperial German Headgear Uniforms Insignia & Awards Field Gear Other Imperial Russian Headgear Uniforms Insignia & Awards Field Gear Other Other Countries Headgear & Helmets Uniforms Field Gear Other Battlefield Relics back Mouse over to Zoom - Click to enlarge WW2 Trench Art

For anything more serious, begin with Ozium Air Sanitizer Spray as a first-stage treatment and use Little Trees or a vent clip for ongoing fragrance maintenance
Available in Brass, Gold, Gunmetal or Silver finishes Holds 16 Cigarettes Carved Design on both Sides Fits Up to King Size 84mm Length Elastic
Cuts Up to 60 Ring Gauge Cigars