Since 2006, the CORESTA Cigar Smoking Methods Sub-Group conducts periodic collaborative studies in order to improve repeatability and reproducibility measurement methods of different cigar sizes and types.

This 11^th Collaborative Study (CS) has been conducted on cigars smoke analysis (TPM, water, nicotine, NFDPM, CO and puff count). The purpose of the 2015 11^th CS was to re-establish mean values for NFDPM, nicotine and carbon monoxide for different sizes and types of cigar products and test pieces via a collaborative study and to provide a tool for participating laboratories to prove competence in cigar smoke analysis.