In the 1982 Wolverine miniseries, Logan is poisoned before Shingen humiliates him in their fight. His body can keep him alive through it, but the poison still affects him. Shingen gets to take advantage of that.
That's an important detail when talking about Logan losing there. He hasn't walked into a fair contest in perfect condition. The other side has already done something to him, and being able to heal doesn't immediately remove the disadvantage.
Then Uncanny X-Men #173 has him use the power to help Rogue. She gets badly injured protecting Mariko, and he lets her absorb his healing ability even though he needs it too.
Rogue knows that could leave him in trouble. He does it anyway.
Considering how things have been between them, that's a big decision. She has just put herself in danger for someone he loves, and he isn't going to stand there and let her die when he can help. His own condition still matters, which is what makes offering the power a risk in the first place.
In the 1982 Wolverine miniseries, Logan is poisoned before Shingen humiliates him in their fight. His body can keep him alive through it, but the poison still affects him. Shing…
· Comics / Marvel / X-Men