Good Lord, how many cigars do you have?? If it' s only a box or two, I doubt that the moisure just from them is going to damage your guns much! If you tried to maintain the overall humididty of the interior of the gun safe at 70%, make sure your guns are well covered with a rust-preventing product like Birchwood Casey Sheath or Shooter' s Choice Rust Prevent! !But cigars are supposed to be stored in a HUMIDOR, to keep them from getting too dry!! A gun safe should not be substituted for a humidor!!