We have been venting our dryer inside for several years now, and have had no moisture problems, and I've heard from other people with the same experience.
BUT, it is possible to have the extra moisture from dryer venting cause serious moisture problems including mold growth, so this is something to watch very carefully.
Be particularly vigilant after you start venting inside for any signs of moisture problems, and stop venting the dryer inside if you see any sign of problems.
Gary