Would this be against TOS?

[AwesomePossum212]

Also, to quote a post by @Aotrou on a similar-ish topic, it can depend on how you portray it. See below.

Question about the drug use rule in ROBLOX

In contrast to what AwesomePossum said; I’ve said this before on the forums - if there’s a narrative reason behind having a specific asset or design, you can generally have it in your game. In this case, you’re probably fine. For instance, if I needed a syringe for a character that narratively needs insulin injections, then that’d be fine. If I needed the syringe so my players can use illicit drugs for the hell of it, obviously not. Same asset, narratively different. They’re case-by-case guide…

However, I would still recommend avoiding illegal drugs in general, since they can be portrayed and interpreted in many ways.