Gonzo said:
While I always loved the added aroma of apple, sometimes it can make adjacent tobacco a little mushy/moldy. I found orange peel worked well also.
I believe you can still buy clay humidifiers as well. They are usually a small tin disk with a clay tablet inside. You would soak the disk for a while and then, once it has absorbed some water, add it to your pouch.
Cheers,
Gonzo
I have been smoking American Spirit for years. I get it in the bulk tins. Sometimes it is perfectly moisturized and other times it is dry. Even if it is fine when I break the tin's seal, it will dry out in a few days after opening.
I take a Kleenex type tissue, fold it over a couple of times into a long strip, wet it and stretch it across the top of the tin, then snap the plastic lid over it to hold it in place. The next morning, when I open it to roll the day's smokes, the tobacco is nicely supple. If I were using the pouch type, I would go to the tobacconist and buy the humidifier buttons that Gonzo suggests.
Tobacco is easy to bring back to the desired state of moistness. I have leaf hanging in the garage from last years crop (awaiting completion of the curing chamber). It dries to a condition of extreme crumbliness if handled roughly, but after a day or two of rain outside it becomes nicely soft and pliable. It will readily absorb atmospheric moisture.