If you catch it early, hit it with rubbing alchaol (sp) If it totaly covers the stem everything above is shot. If only half the stem is molded hit it with alchaol every second day. It can be stopped in its tracks,

Now look into the center of your biggest tops. Your next war I bet will be with bud rot. Get your humidity down below 50% asap. If you see little mold spots, bust out the alchaol again. Welcome to the mold wars.

Answers to your questions

1)Cut and remove all molded plant. Smoke it at your own risk...That means no
2) maybe... get your humidity down.
3) yes.