Everyone understands why one should quit smoking, but it's easier said than done.
Tips
history
Rooted in 《尚书·说命中》: 非知之艰,行之惟艰 - Fu Yue's counsel to the Shang king that 'knowing is not the hard part; doing is.' Sun Yat-sen famously inverted this into 知难行易 (zhīnánxíngyì) in his political philosophy.