Yeah, if Seafoam produces that much toxic smoke, I would ask that it not be done at my house. My neighborhood is very close knit (read: paranoid)and tend to call LEOs at the drop of a had...or should I say, a puff of smoke.
Also, I just remembered my next door neighbor's kid has had respiratory problems in the past, pneumonia being one of them. I'm really friendly with them, and don't want to jeopardize anyone's health, least of all an 8 year old kid who's already a cancer survivor.
I'm sorry to be a wet blanket on the Seafoam blowouts, but I really don't think it's a good idea to do around here. Having said that, I hope folks will still show up for detailing.