well, you know your father better than the rest of us.
but i personally would suggest telling him, but he may not like it.
and by the way, dont u have to be a certain age for this forum? i could be wrong eh
anyway, do what YOU think is right. i personally wouldn't let MY son smoke untill at least 16, because i am under the impression it is something you need to be responsible about, and since there is SO much responsibility, i think adding marijuana to the list of responsibilities is just too much untill you are older with a somewhat-steady job, doing well in school, other extra-curricular activities, and maybe bills to pay.
but whatever whatever, i dont even know you or your father, so ... i'm out