戒情不戒烟伤肺不伤心
[jiè qíng bù jiè yān shāng fèi bù shāng xīn]
'Giving up affection but not cigarettes; harming lungs but not heart.' It illustrates a mindset where avoiding emotional attachments is seen as less hurtful than dealing with unreciprocated feelings, compared to the harm done by physical bad habits like smoking.