I did that with a 30 yr old batch of tobacco. Large slice of Red Deliscious which I wet first then left in bag for 24 hrs. But, I then promptly smoked the tobacco over next two weeks so I never saw mold growth. It was very common in old days.When I was a kid, the old guys used to put a piece of apple in a pouch to keep the tobacco moist. That OK to do? I’ve got a pretty dry pouch that I must have left open awhile.