The current US Core Smoking Status definition states: 

This value set includes codes from the following code systems:

Include these codes as defined in http://snomed.info/sct
Code Display
449868002 Current every day smoker
428041000124106 Current some day smoker
8517006 Former smoker
266919005 Never smoker
77176002 Smoker, current status unknown
266927001 Unknown if ever smoked
428071000124103 Current Heavy tobacco smoker
428061000124105 Current Light tobacco smoker

Issue:

The value set uses display text that is not represented in SNOMED CT as either a fully specified name or synonym of the concept ID. This creates confusion regarding what display name is appropriate for transmission with the SNOMED CT concept.

Suggested Solution:

1) Change the value set to display the SNOMED CT fully specified name or preferred term in the value set definition

2) Add text to the value set definition indicating if a display name other than the SNOMED Preferred term must be transmitted when concepts in this value set are used.

Please make this change applicable to FHIR US Core STU3 and R4 (When available).