Table 1: Expected number of smokers based on age distribution of patients with reference to U.S. 2012 report.
| 
 | Expected | Observed | p | 
| All patients | 
 | 
 | 
 | 
| Ever smoker | 196 | 186 (37.5%) | 0.35 | 
| Never smoker | 300 | 310 (62.5%) | 
 | 
| Patients with VME | 
 | 
 | 
 | 
| Ever smoker | 16 | 20 (49%) | 0.16 | 
| Never smoker | 25 | 20 (51%) | 
 |