Figure 2: Different wording or scoring of similar questions is a source of inter-instrument variability. A Smokers are split by those indicating that they either have, or have not, ever had withdrawal symptoms (i.e. felt sick when you cut down or stopped using) (DSM-IV-Q7). Bars represent the number of smokers that answered they never, rarely, sometimes, or often felt irritable or angry when cutting down or stopping using cigarettes or when not been able to smoke for a long period of time (ICD-10-Q3a). B Smokers are split by those indicating that they do or do not smoke when ill (FTND-Q6). Bars represent the number of smokers that answered they n/a (No, I donít have to, I smoke so little), stop, cut down, or smoke the same amount when sick with a bad cold or sore throat (ICD-10-Q6b).