Hey Dave,
Hope you're well. I'm 27 with CF... currently awaiting a lung transplant, lung function is down to 20%. Don't worry about getting tattoo's, you only live once. I've sat in the tat chair 13 times over the past 9 years. They're addicting for me. Just about each time I get discharged from the hospital I find myself going out for another. It's been a form of venting for me. Some may not approve of this, but it's they're right to disapprove, and my right to continue getting more tat's. I wish you the best of luck with your health and the tat you end up getting. I guarantee that if you get one... you'll be back for another.
If you ever want some to chat with, that's been there and done that... I've gone through a lot with this illness, and would enjoy talking to anyone. Feel free to write me at "farbeyond1@cox.net"
Take care,
Mike