Where should I buy duty free cigarettes when flying to Egypt?

I'm flying to Egypt next week and I plan to buy as many cheap cigarettes as possible; so would it be best to buy them on the way out or the way back?
Thanks

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).