The old ways still work.
I use a 40 year old 7 ounce Prince Albert tin to hold the bulk tobacco that I smoke at my desk. A couple of weeks ago I decided that the tobacco from the tin was too dry and burning too hot, so I got a small apple, cut it in quarters, and put the apple quarters into the tin with the tobacco. I covered the apple slices with the tobacco. Within a few days, the tobacco was satisfactorily moist, and had gained a nice additional taste. The apple slices were then discarded.
I use a 40 year old 7 ounce Prince Albert tin to hold the bulk tobacco that I smoke at my desk. A couple of weeks ago I decided that the tobacco from the tin was too dry and burning too hot, so I got a small apple, cut it in quarters, and put the apple quarters into the tin with the tobacco. I covered the apple slices with the tobacco. Within a few days, the tobacco was satisfactorily moist, and had gained a nice additional taste. The apple slices were then discarded.