In order to explore the inhibitory effect of EGCG on nicotine which induced lung cancer cells proliferation, this study selected the optimal concentrations of EGCG and nicotine on lung adenocarcinoma cancer cell H1299 by MTT experiment, and detected mRNA relative expression levels of Bax, Bcl-2, Jak2 and Stat3 genes in H1299 cells using qRT-PCR technique. Experiment results showed that the IC50 of EGCG on H1299 lung adenocarcinoma cells is about 32 μmol·L-1 (treated 48 h) and 15 μmol·L-1 (treated 24 h), nicotine obviously promotes the proli...