Once you pop a cars cigar cherry its done. You can try to mask it but to the non Botl or Sotl they will know in a second. Not a tactic I would try but I heard Cigar Coop interview a guy who had a suggestion. Get the car then go back to the rental desk and complain of smoke smell right away. When you return it with a new aroma its already documented that it smelled. If they call bs on it your stuck with the bill. Can't you rent a Harley or something?