Hey
I don't think I have ever seen anyone vaping in Turkey. But I don't get out that much. :-)
Smoking is still a popular pastime!
I know someone who visits Turkey regularly, and he has never had an issue bringing his smoking gear in. But this is Turkey!
I use a website that can be found using elektroniksigaraevi
You can get delivery within the a few days, so maybe worth a try if your hear for a couple of weeks.
I hope that helps.