I am hoping you can help me find an appropriate concept_id for the fact_relationship table to link two tobacco use concepts together. Filtering on concept_class_id = Relationship or filtering on vocabulary_id = Relationship gives me the same 402 concepts. Only 10 of those concepts are standard concepts. None are appropriate for linking together two social history facts. What standard relationship_concept_id should I use? I also have use cases to link sexual activity and contraception type; alcohol intake and start/stop/quit dates; illicit drug use concepts.