or so you to use them in laboratory have to a special permit and this is what we want to release into environment
Dozens of substances in cigarette smoke are so toxic that, if you want to use them in a laboratory, you have to have a special permit, and yet this is what we want to release into people's everyday environment.
of in are so you to use them in laboratory, have to a special permit, and this is what we want to release into environment.