OK, I've done well over 100 tattoos now and on a couple of occasions I have tattooed a person whose skin doesn't seem to want to take ink. In the latest instance, I lined the design with a 7RL and the line was very fine, more like a 3, and after about a half hour I could barely make out the lines at all. Then shading ( black, with a 7RS ) I had to go over and over it to get a good solid black.It seems to happen to 'pudgy' girls who smoke, would this have something to do with it? I haven't changed needle or ink brands or anything else, it just seems that some people don't take the inkwell at times.Very frustrating. Has anyone else dealt with this problem? Any advice?