I Recently Started HRT, But I'm Struggling With A Nicotine Addiction and I Don't Know What To Do

So. Yeah. I recently started Testosterone, which I'm very happy about, but the one thing I'm worried about is the fact I have a nicotine addiction. I've been smoking/ vaping since I was 15, and I've tried to quit before but it's been a struggle every time. I'm aware that using nicotine while on HRT can make it less effective, and can even pose heart risks- I'm especially worried about that because I did briefly suffer from Tachycardia. I just don't know what to do and was wondering if anybody has ever been in a similar situation that can help with some advice. Hope you all have a beautiful day 🫶