First of all, smoking is illegal.
China's "Protection of Minors**".
Article 17.Our Law on the Prevention of Juvenile DelinquencyMinors' parents or other guardians must not carry out the following conduct: (4) Allowing or instigating minors to smoke (including e-cigarettes, the same below), drink, gamble, wander and beg, or bully others;
Article 59
Schools, kindergartens shall not be set up around tobacco, alcohol, lottery sales outlets. It is forbidden to sell cigarettes, alcohol, lottery tickets to minors, or to redeem lottery prizes. Tobacco, alcohol, and lottery operators shall set up signs in conspicuous places that do not sell tobacco, alcohol, or lottery tickets to minors;Where it is difficult to determine whether they are minors, they shall be required to present their identification.
No one is allowed to smoke or drink alcohol in schools, kindergartens, and other public places where minors gather for activities.
Article 28Therefore, talk openly and honestly with your parents, understand each other, and exchange views with your parents."Negative conduct" as used in this Law refers to the following conduct carried out by minors that is detrimental to their healthy growth:
1) Smoking, drinking;
Article 29
Where minors' parents or other guardians discover that minors have negative conduct, they shall promptly stop it and strengthen discipline.
Here are some suggestions to deal with this situation:
1.Calm and honest: Remain calm and open in response to questions or accusations from parents. Try not to try to cover up or lie, as this can exacerbate the severity of the problem and the disappointment of parents.
2.Understand and accept parental reactions: Parents may feel worried, angry, or disappointed because smoking can have serious health implications. It is crucial to understand parents' emotions and accept their reactions.
3.Know the harms and consequences: Seek information about the harms and consequences of smoking, and truly understand the health effects of smoking, as well as other issues that may arise. This will help you better understand your parents' concerns and be motivated to quit. 4.Listen to parents' advice and perspectives: Parents will be thinking about your health and well-being, so some advice and perspectives will be given. Listening to their advice and seriously considering adopting it will be beneficial for your future development.
5.Seek support and help: If you want to quit smoking, it's important to seek support and help from parents. They can provide you with resources, advice and support, or help you find professional coaching and support for smoking cessation. 6.Make a quit plan: Work with parents to create a quit plan, set goals and a timetable. This plan can include gradually reducing the amount of cigarettes smoked, switching to smoking cessation products, or seeking professional smoking cessation counseling.
7.Develop a healthy lifestyle: Quitting smoking is only one part of a healthy lifestyle. By increasing physical activity, improving your diet, and finding other hobbies of interest, you can help build a healthier life. 
Most importantly, maintain communication and interaction with parents so that they feel that you are sincere about the issue and are willing to take action to improve. At the same time, learn to learn from your mistakes and make positive changes.
Parenting