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. 2013 Mar 15;8(4):383–388. doi: 10.4161/epi.24195

Table 2. Methylation of NISCH was seen in plasma from controls in both former smokers and current smokers who smoked 20+ pack/year.

Controls Former Current
20–35 py
 11/17 (64%)
 13/20 (65%)
35+ py
 15/25 (60%)
 19/23 (83%)
Combined (20+ py) 26/42 (62%) 32/43 (75%)

Py, pack/year.