Variability in biomarkers of exposure levels in smokers in a study of smokers switched to reduced toxicant prototype cigarettes

. Variability in biomarker of exposure levels in smokers in a study of smokers switched to reduced toxicant prototype cigarettes. Christopher J. Shepperd1, Alison Eldridge1, Graham Errington1, Oscar M Camacho1, Kevin McAdam1, Ingo Meyer2 and Christopher J. Proctor1* 1British American Tobacco, Group Research & Development, Regents Park Road, Southampton, SO15 8TL, United Kingdom 2Momentum Pharma Services, Hamburg, Germany *Correspondence: christopher_proctor@bat.com