I could see little amount of blood mixed with saliva when i spit. This happened to me couple of times. However, it's only 2 or 3 times in a month. I'm not sure if i am getting it from gums or from the other areas. I believe if it's from gums, i would be know.

Note: The blood is not dark red and i'm  a passive smoker.

Can any one suggest me on this.