THC: C21H30O2, LSD: C20H25N3O, Heroin: C21H23NO5
The list goes on.
In: Chemistry
Many organic chemicals have complex formulas. Mostly beacuse their base structure is a carbon skeleton, which can get more or less arbitrarily large.
Besides that, there is another reason why formulas are less meaningful in organic chemistry: isomers. Isomers are chemicals that have the same formula, but the atoms are arranged in different ways. A prime example:
C2H6O
This can be either [ethanol](https://en.wikipedia.org/wiki/Ethanol#/media/File:Ethanol-2D-flat.svg), which among other things can be freely mixed with water. If you rearrange the atoms, you get [dimethylether](https://en.wikipedia.org/wiki/Dimethyl_ether#/media/File:Dimethyl_ether_Structural_Formulae.svg), whch can only be mixed with water in a limited amount.
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