In 2014 I wrote about what's the worst that could happen with a malicious USB stick [1] and the first comment was "if we're going with physical attacks, it might as well just be a bomb." Well!
Since learning about the ricin connection it's always been a source of bemusement whenever I think about it.
Edit: presumably by 'a lot' you mean milligrams (by ingestion) and not micrograms. From my understanding eating 100mg would be a certain death sentence.
Barring mad scientists with chemistry sets and a grudge. And even in such a case it may be safer for said mad scientist to homebrew explosives in favor of chemical weapons.
It is sensitive to temperature variations, high temperatures, ANY open flame, ANY friction (rubbing your fingers together is more than enough), ANY shock, such as failing to set down a container, dish, or vial slowly enough, and having a small static charge in your body will also set it off. Because of this, TATP actually has no current industrial or military application.
Realistically you need something odorless (=exotic enough the human nose hasn't evolved to detect it), fast acting (=highly reactive/unstable), and dangerous at low concentrations (=likely to kill you while making it).