How can I hide the fact from my parents?

You can not hide the fact that you smoke. The smell gets in your hair, your clothing, your breath. Now that they know that you smoke they would not believe you if you told them it was from just being around people that smoke. Go to your family doctor and tell him or her that you want to quit smoking. There are thing on the maket that will make it easier to quit. Do not start a program to stop unless you extreamly want to quit. Even with these pills or patches it is not easy to quit. You realy have to be very serious about quiting to make it work. I know I quit after about 40 yrs. I have been off smoking now for 20 + years. I quit long ago but I realy had a hard time even with help. I truely hope you quit and do not end up like my wife and I are now. We both have COPD, and she is on oxygen 24/7, we are also onl other medication for this condition. I hope you quit early enough that you do not have to be like us. Good Luck.