I don't find some drying in tobacco a bad thing. It keeps surprisingly well for quite a while. On the other hand, I like to keep my pipes in rotation, so I always finish up a smoke the next day or two before I pack another pipe, and clean out the used one. Tobacco can sit around in a ceramic bowl where I mix it for some weeks and still be entirely smokable. I don't recommend this, and it does kill flavors in some blends, but often it is just fine, maybe a little different, maybe improved depending on your mood. Moisture can be a fetish. Most short-term drying is no problem.