Cigarette smoke extract caused necrosis with no or little evidence of apoptosis in rat lung epithelial cells (L2). Rat lung epithelial cells (L2) were treated with media alone (control) and various concentrations of CSE; a) control, b) CSE (1.0%), c) CSE (2.5%), d) CSE (5.0%), e) CSE (7.5%), f) CSE (10%) for 24 hr. Results are mean of 3 experiments ± SEM. §p < 0.001 compared with control group. L = Live; A = Apoptosis; N = Necrosis.