SHOULD I KEEP MY BABY'S FATHER INCLUDED?

SO MY BABYS FATHER AND I HANG OUT AND HE IS 21 AND I JUST TURNED 20 TODAY..AND I AM ABOUT A MONTH AND A WEEK PREGNANT. i WAS WONDERING IF U THINK I SHOULD KEEP HIM INVOLVED AND I HAVENT TOLD HIM YET..THE THING IS I ONLY KNOW HIM A LITTLE BIT AND HE DRINKS AND SMOKES ALOT AND IDK HOW HE IS GOIN TO TAKE IT. I AM IN COLLEGE NOW BUT I AM LEAVIN IN 2 DAYS TO ANOTHER CITY AND I WON'T SEE HIM FOR A WHILE CAUSE I WONT BE LIVIN HERE ANYMORE AND I JUST WANTED TO KNOW SOME ADVICE ON WAT I SHOULD DO??? THANKS A LOT!