I haven't had a ton of sticks in cedar sleeves and have yet to have an issue. I did have an H. Upmann Vintage Cameroon that stayed in it sleeve 8+ years in my humi with no mold issues, it smoked like a dream too... This was all before I joined BOTL and heard all the mold stories (mostly all Fuente related). Now I pull the cedar sleeves off out of precaution, the last thing I want to do is reach into the humi for a nicely aged stick that I spent good money on and see it covered in mold. Better safe than sorry IMO