My mom claims she is a master of cooking, but I'm always telling her, "DON'T COOK with poison!"
'poison tongue' - in English, we'd say a sharp tongue
regular ,intentional poison- as opposed to toxic pollutants or drugs.
Sugar damages your mouth, but the addict eats it EVERY day.
be addicted to, have a bad habit of...
はまる 癖になる やみつき 中毒