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Histopathological findings for lungs in Groups 4–6. Inflammation in Groups 4, 5 and 6 persisted until autopsy (week 30) with severe lymphoid cell infiltration around the bronchus (A–F). A, 0.10 mg nicotine ×3 (Group 4) (magnification: ×12.5); B, 0.10 mg nicotine ×3 (Group 4) (×100); C, 0.10 mg nicotine ×4 (Group 5) (×20); D, 0.10 mg nicotine ×4 (Group 5) (×100); E, 0.20 mg nicotine ×3 (Group 6) (×12.5); F, 0.20 mg nicotine ×3 (group 6) (×100).
