吸烟的年数number of years one has been a smoker

• 老王是个有几十年烟龄的“老瘾头”。

  Old Wang is a hardened cigarette addict, who has been smoking for several decades.

• 已有了两年“烟龄”的他，下狠心把烟戒了。

  He, someone who had been smoking for two years, made a firm decision to give up.