I was told that an 8 oz serving of regular coffee per day is fine. Believe me, if I did not have my daily morning cup of coffee, I think that my husband would leave me! lol I can get pretty pissy without it! When I am grumpy and it is about 2pm in the afternoon my husband will calmly ask, "did you forget your coffee this morning?" Then I think about it and sure enough, I got so busy in the morning that I totally forgot to have my cup of Joe.
I have given up soda 6 months prior to surgery, I have never smoked, I used to drin****asionally (no more), I have also given up on refined sugars and I do not eat any frozen or canned fruits or vegetables since surgery. I have been living a very "clean" life and our food that we purchase and prepare at home is made with whole grains, grass fed proteins and a lot of water so I do not feel bad about ingesting my 1 8oz serving of coffee with soy milk added.
If it makes life easier for you to have a cup of coffee then I say go for it!

You have to have at least one guilty pleasure!