Table 3.

Epidemiological Model of Postmarketing Surveillance Issues, Coupled to Related Concepts From Diffusion Theory

	Surveillance targets	Surveillance variables	Diffusion conceptsa
Agent	Modified-risk tobacco product (MRTP)	Product stability	Benefits of use
		Product performance	Costs of use
		Nicotine delivery	Consequences of use
Vector	MRTP manufacturer	Compliance with approved marketing
	Other manufacturers	Marketing practices
		Competitive pricing
		Competing products
	Retailers	Pricing, placement, promotion
	Users	Viral marketing
Host	MRTP users	Perceptions of absolute and relative risk	Demographics
			Socioeconomic status
		Health beliefs	Social position
		Intentions to quit	Familiarity
	Nonusers	Perceptions of absolute and relative risk
		Health beliefs
		Trial of MRTPs
		Intentions to use product
Environment	Availability	Number and location of retailers stocking MRTP	Geography
			Culture
			Political conditions
	Regulations	Clean indoor air laws
			Institutionalization
		Local sales and advertising restrictions
		Taxation

^aAdapted from Wejnert (2002).