All living and nonliving things are constituted from chemicals; some chemicals we find desirable and others we regard as undesirable. Lots of plants, for example, produce a range of chemicals we like (starches, sugars, flavours etc) and some produce chemicals we can use, in small doses and with care; aspirin, atropine and quinine are just the first three off the top of my head. Many of the flavoursome ones are really part of a plant's armoury (read chemical warfare against being eaten by insects and larger herbivores) and, although small doses are pleasant to us, larger doses can be harmful and downright toxic. They're all natural but we've gone to a lot of trouble to synthesise them in quantities and versions that are useful to us and lots of 'uninformed' people regard these latter as (automatically) bad because they're not natural, even though they may be identical.

But they're all chemicals.

Cheers (and bon appetit!), Rowan