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Table 1 Study timeline for pre-post evaluation of smoking behaviors and biomarker levels from smoking cigarettes

From: Cigarette ignition propensity, smoking behavior, and toxicant exposure: A natural experiment in Canada

Condition   Pre-RIP   Switch   Post-RIP  
Visit 1 Field 2 RIP Law Change 3 Field 4
Product N N N R R R R
Breath CO X     X   
Saliva Cotinine X     X   
Urine PAH
X     X   
Topography   X X    X X
  1. N = non-compliant cigarette; R = RIP-compliant cigarette
  2. The timeline represents the treatments given to participants on each day of the study; Ontario, Canada, 2005-06.