Would you be concerned about health risks if i smoke a pipe between four times a year and once a month? no other smoking history

Yes: Not a good thing to do. The intentional habit of inhaling burning organic material, combined with various chemicals used in the growing and manufacturing of that material (regardless of whether it is tobacco, marijuana, or any other plant) is bad for the body. Just think about it. Who would intentionally start something burning and inhale the stuff over and over and over?