I have been working with a group on conventions on how to store information in OMOP CDM with the intent that it will be ETL’ed from OMOP to PCORnet. Here is how we plan to record smoking information. All the smoking related concepts are stored in the Observation table under a single observation concept id 4041306 (Tobacco use and exposure) and the specific smoking concept values are in the value_as_concept_id. This convention makes it easy to find all the related smoking information for a person.