In a message dated 12/6/04 2:16:59 PM Eastern Standard Time, gmhyde1@mac.com writes:

Did you leave your Origo burning all night? I was wondering if carbon monoxide is a problem with an alcohol stove.

No, just while I was awake. I'm always nervous about carbon monoxide. I had two hatches ajar for cross ventilation. It's the original 1971 Origo stove. One of the cannisters burns clean and there's absolutely no odor; the other will run you out. I'm not sure what does it but I'm going to look around for replacement cannisters. I'd replace the whole thing but the stove folds away on a tricky shelf; very Ikea. There's no place to put a retrofit gas stove. Anyway, the nonpressurized alcohol systems are really safe.