DRO and budget for vaping (medical advice)

I have a friend who is the position of applying for a DRO.
The adviser considers she is eligible, but has flagged up a couple of issues with her "outgoings", which in my opinion are reasonable objections (she still qualifies even if they were removed).

One expense is for vaping, which I would have regarded would be treated in much the same way as smoking. Advice on smoking is that sometimes a "smoking expense" is allowed, and other times not. Personally I have issues with people being in debt and smoking, but I appreciate the difficulty.

I should add that she is on long term medication for anxiety and depression, and over a year ago switched from smoking to vaping after 30 years on tobacco. If we were to get a doctors letter supporting a "well being" reason why for the next year she should vape (ultimate aim to stop vaping), is this likely to allow vaping as an expense on the DRO submission?