From Wikipedia, the free encyclopedia
Yn gyffredinol, sylwedd cemegol sy'n newid ymddygiad corfforol normal pan gaiff ei amsugno i'r corff yw cyffur. Ceir cyffuriau a ddefnyddir i drin afiechydon a chyffuriau hamddenol (e.e. alcohol, caffein, tybaco, a channabis).
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