How can you commit suicide without pain?
Hanging is safe, but you can hang there for 2.5-3 minutes before you're losing your conciousness. That hurts too much.
Drowning, no way!
Jumping, it might not cause death if you land on your feet.
The dangerous things with most methods is that people often survive, it can't be fun to be a paralyzed moron (lack of oxygen i the brain is often the reason).
First of all, I'm not suicidial at all. I'm just interested in suicides, I'm writing about stuff like that. The question is: Is there a safe, easy, and nice way to commit suicide (if a gun is not available)?