Mae anfantais economaidd-gymdeithasol, fel diweithdra ac incwm is, yn gysylltiedig â salwch ac mae'n fwy tebygol o ysgogi ymddygiadau nad ydynt yn iach, fel ysmygu.
Socioeconomic disadvantage, such as unemployment and lower income is associated with ill health and is more likely to trigger unhealthy behaviours such as smoking.