An important factor that affects Teacher Xuefeng's health is actually smoking. After 21 years, the stress increased, and coupled with friends around him encouraging him to smoke~

Actually, I used to not smoke either, but I started because friends around me encouraged me. Fortunately, I have good self-control, so now I only smoke during holidays when I’m at home.
Since moving back to Guangzhou and living alone, I haven't smoked. But I plan to quit completely from now on, no matter where I am. I want to quit for good—don't worry about face or anything.
Your health is the most important!