Development and validation of a ddPCR assay to detect and quantify tobacco DNA in smoke and smokeless tobacco and tobacco-free products, Fraiture, Marie-Alice, Gobbo Andrea, Guillitte Chloé, Barhdadi Sophia, Gau Céline, Philipp Patrick, Marmin Lucas, Marchesi Ugo, Verginelli Daniela, Papazova N., et al. , Heliyon, Jan-06-2024, Volume 10, Issue 12, (2024)