Martha.
It's possible to keep yourself protected until the smoke goes away. Rock salt, amulets. I want you to line your doors and windows with rock salt. I'll bring you an amulet as soon as I can.
The host can no longer control their body. Coming from a personal experience? It's far from fun. You're stifled. Useless. Trapped away in the farthest corner of your mind while someone else takes hold of the steering wheel and controls your life. Most of the time the people that you love don't even know that you're gone. It's terrible. I wouldn't recommend physically harming the body too much. Some damage can't be reversed and it won't be the demon that you're killing off.
You're not gonna let the health insurance thing go, are you?