how can i convince my dad to let me have a zippo

Give your dad a break. He is working to keep you alive and then has to come home and listen to you trying to convince him of something. It is not fun.
.

You don't. Evidently you are not old enough to have one if you need to ''convince'' your father.

What is it you plan on smoking?

Well they have age limits for a reason. However, the zippo is innerworkings are removable. If you're wanting something cool looking maybe you can convince him to get you one if he takes out the ''lighter'' part to it, because truthfully, someone under 16 does not need to play with anything that causes fire. But if you're insisting on having the zippo as an actual functioning lighter. well I really can not help you there.