What is the Least painful way to die?

Anonymous
I mean, We all know that dying is almost always guranteed to be pain and suffering, But what is the most painless and quick death you can have?

I mean you got the following obvious ones people are gonna say that aren't painless such as :
Drowning Yourself- Would be agonising
Hanging Yourself - Sufficating whilst your neck snaps? Ouch!
Shooting Yourself - No guns in the UK :/
Jumping off Height - The fall would be Terrifying (+Messy)

Is there any truly painless and quick way an individual could kill themselves? Dosent seem like it :/
What is the Least painful way to die?
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