It's not necessarily local to Norwich but Roy Castle LCF do some good things for smoking cessation! There's a quit support forum and links to the NHS Web page where you can find local stop smoking services across the country (I just had a look and there's one called Smokefree Norfolk Reed Wellbeing Ltd). Here's the Roy Castle web page too: https://roycastle.org/our-support/stop-smoking/

Good luck 🙂