You will never find a true answer for this question. But I think it depends on the person. I know it's not safe when the person taking the x-ray runs and hides behind a lead wall
but it depends on where it hit's your body, I know it's bad to x-ray you kneck because of your thyroid, I have had a picc line put in me and they had to take live x-rays and they couldn't leave the room, and they all had extra neck guards to protect there thyroid. Yes it could cause cancer, but our bodys are always fighting off cancer and it's up to our bodys to loose the fight. What i'm trying to say is if an xray made cancer start growing in our body useually our body would fight it off and we would never know what happened.