I'm going to confess to my parents about smoking
Why do you want to confess to them now?
It'd  be fun to see their reaction when I told them something like that.
I guess it's good that you are going to be honest with your parents about your smoking. It's always good to be open with them.
Exactly what I was thinking too.
As long as you are sure that you are ready for what they have to say, you should tell them. It is important that you try to be honest with the members of your family.