2．原因：有的认为是时髦（a kind of fashion）有的认为是乐趣，有的认为可以提神（refresh oneself） 3．害处：吸烟有害健康，可导致多种疾病，是金钱的浪费，甚至会引起火灾。
双语例句
1
Some people think that drinking coffee can refreshoneself.
有人认为喝咖啡可以提神呢。
2
And there's no better season to refreshoneself than in spring, when it's usually cool and bright.
而凉爽明媚的春天是最能使人精神振作的季节了。
3
However, sometimes when stress from my workload is overwhelming, and I have to stay up all night, smoking can refreshoneself, and provide me with inspiration.