No you're allowed them in the stadium, heres a reply from City i got;
Thank you for taking the time to contact us. As a smoker myself I appreciate why you are asking the question.
We here at the KC, along with the majority of stadiums, are very much undecided with regard to smoke-free aids. On one hand, we have no issue with them in themselves. However, other stadiums we have talked with have found that the use of smoke-free aids has, at times, been seen as a ‘green light’ or ‘cover’ for other fans to begin to smoke real cigarettes. Additionally because we cannot determine via CCTV whether a cigarette is real or not, then the ‘smoker’ must be challenged. This in itself can cause conflict as we have to challenge often as there have been cases of people using a smoke-free aid and then ten minutes later having a real cigarette!
As is the way with so many rules, they are often created not because of the core issue, but because some people abuse a generic privilege or system – which is a shame.
Rather than to openly state that we are permitting smoke-free aids our policy, just for the moment, is to permit the use of smoke-free aids and then ‘wait & see’. We will make sure our stewards are aware of this.
I completely understand that our policy is not ideal, but for you, but I hope I have properly explained why our position is as it is and also the reasons why something as harmless as smoke-free aids could possibly be banned at some point.
Ann Holland
Community Liaison
Hull City AFC
The K.C. Stadium
The Circle
Walton Street
Anlaby Road
Hull HU3 6HU
Tel: 01482 304835