What are some poisons that could work besides SN, N, SA, Fent, H?

[NeetAccount1]

For when SN eventually get's harder to source.

 

[waitingforrest]

I don't know but I don't really recommend poisonous plants as they can be unreliable and could have bad side effects.

 

[its-about-time]

Hypoxia seems like the way to go for me personally, there are numerous types of hypoxia and several are pretty peaceful, I guess any poison that causes those types of hypoxia would do. Though I think if SN becomes unavailable, hypoxia via exit bag w/ inert gas will become the next "big thing," as inert gas is quick, painless, and will always be available to the general public.