This happened to some GL Pease Flake that I had in glass Ball jars.The best you can do is to toss it out.I immediately opened my other,untainted jars and allowed the flakes to air out for half a day.The tobacco was quite moist to start with,and in my absence,the room got a little bit warmer than it should have,and there you have it........mold.My bad.So........Lower the thermostat,air out the tobacco a bit,keep out of direct sunlight,and in a sealed glass container.