That is, of course, possible. However, a lot of people need transplants for reasons that are completely no fault of their own, or within their control. For example, my sister was born with a hole in her heart. She had open surgery shortly after birth, and has to regularly visit the hospital for checkups, and several follow-up operations as she's grown up, and is now fully healthy, but in later life there is obviously a much higher chance of her having heart trouble. It is completely plausible that she might need a transplant, and that isn't through her abusing her body.