The baker told The Mirror she'd made the "agonizing decision" to leave her post as a secondary school PE teacher in Berkhamsted, Hertfordshire.
Candice, 31, explained: "I have been teaching for about eight years now and I love it. But since winning the final, I have also been completely bowled over by the amazing opportunities that I have been offered."
The star went on to say she'd initially hoped to stay teaching until December, but her fellow staff urged her to make the most of the chances she'd been offered since winning Bake Off, and fully support her decision.
"My head teacher told me, 'You've got to do this, you can't do it half-heartedly. I wouldn't forgive myself if you missed out… If we can't encourage our staff to follow their dreams and inspire, then we are not doing our job properly. You are showing the kids that anything is possible.'"
Those opportunities have included rumours of a cookery TV show with fellow Bake Off contestant Jane Beedle. A source told Daily Star: "Their friendship was the highlight of the show. Producers can't wait to sign them up for their own programme, which would be a lovely mixture of age and experience."
Candice had returned to work after filming Bake Off but, of course, had to keep the result of the show a secret until it aired.
Chatting to The Sun about the morning after her pre-recorded win, she said: "I went straight to bed and got up for work early the next morning, I couldn't talk about it and nothing had changed. I questioned whether it happened. I kept [the trophy] well hidden, even though I would have liked to wear it round my neck all the time."
Candice won the last series of Great British Bake Off to air on BBC. The show moves to a new home on Channel 4 from 2017 after BBC lost the rights to air the programme.
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