How can I tell my father I smoke?

He knows ive tried weed, but the thing is I smoke cigs too. It snot like I have one here and there type thing. I go throw a pack a half in two days. I hate hiding things from him because he is the only family I have left, but I don’t know how to tell him without killing his heart.

I have a cousin who smokes and everytime we are at a family party he cracks jokes because she goes out for a smoke, which is all fun and games. But when it’s me and him in the car he goes “I don’t know why she does that, she is killing herself. I hate when people do that. ” UGH :( i don’t want him to look at me for being a wrong child.

How can I tell him in the easiest yet simple way ?