Thank you everybody for responding to this.
I keep wanting to bury my head in the sand about this because I convince myself I 'enjoy' doing it - getting to taste high calories 'bad' foods everyday.
Manicinsomniac, I appreciate you trying to make me feel better; the problem is, for many years I convinced myself there was nothing wrong with what I was doing and that a), b) or c) did not apply to me.
However, for me, certainly a) and c) now do apply. The chewing and spitting has become so 'normalised' for me that my DH even knows about it, and what's worse, accepts it (although he obviously doesn't like it).
I will always find ways to justify to myself why it's not necessary to stop. When I get the urge to spit and chew, I'll tell myself "this is the last time", but it never is and I secretly know it. If I see bad foods on offer in the supermarket, I will cave and buy them, and look forward to chewing them later.
This is why I wanted to start a thread because maybe seeing other people's responses will give me the kick up the arse I need to really, truly, stop doing this. I realise it gives me immediate pleasure, and 'de-stresses' me, but I know in the long-term it's totally unhealthy.
M78, I may well PM you for the odd bit of advice, thank you so much for the offer!
I chewed and spat this morning - two bags of cookies and some chocolate. All before 10am. I really, really want that to be my last ever chew and spitting session. I could really do with some responses to convince me in my weaker moments that I can do this.
I will also consider telling my therapist, although I will feel awful that I haven't brought up such a major thing before, especially as I've tried to convince him that my major problem right now is my OCD behaviour and that my eating disorder is relatively under control, and has been for some years. I guess that's what I've been telling myself. But it's not true :(
On another note, when I think about how much money I've spent on food that doesn't get eaten, it's shocking :(