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タバコをやめる， たばこをやめる， タバコを止める， 煙草をやめる， 煙草を止める， たばこを止める
1. to give up smoking, to stop smoking
tbd
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ざるを得ない， ざるをえない
1. have to, have no choice but to, cannot help (doing), be compelled to, be obliged to, be forced to
tbd
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
