an inveterate smoker.

• 烟瘾很大的人

an inveterate smoker.的用法和样例：

例句

1. I remember especially he was a heavy smoker.
   我尤其记得他的烟瘾很大。
2. Henry is a chain smoker, smoking at least five packs a day.
   亨利烟瘾很大，每天最少吸五包。