Analysis of essential oil from different parts of Pelargonium odoratissimum and its application in cigarette oleh YIN Hong-fei, CHEN Jian-zhong, LI Yao-guang, LIU Sui-jun, ZHAO Wan-ying, CHEN Meng-qi, YUAN Yao-hong, LI Huai-qi, SU Tong-fu, JING Yan-qiu