A British biotechnology company, already developing a vaccine to help addicts kick cocaine, said on Monday it had started clinical trials on the world's first nicotine addiction vaccine.

　　The product, which is given by injectionsintosthe muscle, aims to prevent the addictive cycle of cigarette smoking by stopping nicotine from entering the brain.

　　However, the initial Phase I study of TA-NIC will merely assess its safety and tolerability at different doses, and researchers still have several years work ahead of them to prove the efficacy of the product. 尼古丁疫苗研发成功 　　一家英国的生化技术公司本周一宣布，他们已经研发出一种能用于帮助烟民戒烟的尼古丁疫苗，并已经开始进行临床试验。

　　这种尼古丁疫苗名为“TA-NIC”，可以通过肌肉注射进入烟民体内，阻止尼古丁进入人脑，从而防止吸烟上瘾。

　　据悉，目前这种疫苗的第一步试验还停留在用量安全标准上，科学家仍需要数年的时间来提高疫苗的效力。