Thanks guys :)
Yes unfortunately 12 hours shifts seem normal now- I ended up doing three 16hour shifts last week (08:30-00:30)! There's a shortage of nurses in my unit at the moment...
I decided to give up smoking for lent because last year I went vegan and ended up sticking with it after lent was over! It's helped me lose weight and feel generally healthier, plus after doing all the research on factory farming etc. I couldn't go back to eating meat, eggs and dairy.