i just think me and him will be great together and i no he and i will be great parents and i want him to be the dad

You asked for advice, right? Well, here it is....go out with your friends, have fun, don't smoke or do drugs! Make your parents proud, but most of all make YOURSELF proud.
Like I tell my kids, ask yourself before you do something "Would I be ashamed to tell my mom and dad what I am about to do?" and, if the answer is yes, then don't do it. Simple.

my parents always tell me not to smoke but im the one that is trying to get them to stop i dont want them to get hurt and he is my friend i see him all the time we go to the same school

I guess what I'm sayin is go a little farther into the future and ask yourself, what would I tell my daughter if she was asking the same question you are?

i would tell her make the best of her life and do what she would live with for the rest of her life .And make the best chose because she cant turn back time

I know it's hard to listen to your parents tellin you to do as I say not as I do kinda thing...they shouldn't smoke either, but you need to know better for yourself not to do harmful things to your body, including having a child before you are not even finished growing yourself.
Not to mention "trapping" a boy into a relationship by getting pregnant would be a terrible start to a relationship!. He will resent you for doing that, and taking away his teenage years too.