1. keep your humidor properly maintained and take those cigars out of the ziplocks. The cigars need to breath a little bit and siplocks do block moisture to a large extent.
2. Many people will dry box their cigars prior to smoking (in a non humidified humidor or cigar box). Mostly to let a cigar dry out a little bit prior to smoking. Some cigars smoke better a little dryer than the recomended 70% humidity.
3. If most of the cigars you smoke draw and smoke better at a lower humidity the 70%, it pays to store them at a lower humidity. I personally prefer most of my favorite cigars when they are stored at about 65%.
Many people find that Opus, cuban and certain other cigars do not burn or smoke well when stored at 70% humidity. If you find that to be the case, those cigars should be dry boxed or stored at a lower humidity.
I hope this helps.