Speed:
A firearm is hard to beat, but it leaves a bit of a mess for whoever finds you.
An Exit Bag[1] is another option, though, you really got to have the willpower to follow through.
Slow:
Alcohol, tobacco, STDs, Meth, Fent, you know... All the fun stuff!
[1] https://en.wikipedia.org/wiki/Suicide_bag
Speed:
A firearm is hard to beat, but it leaves a bit of a mess for whoever finds you.
An Exit Bag[1] is another option, though, you really got to have the willpower to follow through.
Slow:
Alcohol, tobacco, STDs, Meth, Fent, you know... All the fun stuff!
[1] https://en.wikipedia.org/wiki/Suicide_bag