How do I salvage dried out cigars?
The key to restoring hydration in dried out cigars is to do it very, very slowly (about a month) so the cigars do not swell up and crack (much like a boiled hot dog that splits open). Start at a low humidity level of around 50 % RH and increase it by 3% each week until you get to around 70% RH. If you have a passive humidification (sponge) device, this can be challenging since they are difficult to monitor. Electronic systems will give you more accuracy so you can control and monitor the humidity.