Knowledge Index	Item
Familiar Chemicals	Does cigarette smoke contain ammonia?
	Does cigarette smoke contain lead?
Unfamiliar Chemicals	Does cigarette smoke contain 1-aminonaphthalene?
	Does cigarette smoke contain acrylonitrile?
	Does cigarette smoke contain isoprene?
Health Effects	Does smoking cause addiction?
	Does smoking cause blood clots?
	Does smoking cause cancer of the pancreas?
	Does smoking cause erectile dysfunction?
	Does smoking cause lung damage?

Note.

Experiments 2 and 3 used a chemical knowledge index that was the sum of the familiar and unfamiliar chemicals indices.