We know around 7 in 10 smokers want to quit, but quitting can be difficult, and many people make several attempts before they succeed.
Gwyddom fod tua 7 o bob 10 smygwr eisiau rhoi'r gorau iddi, ond gall hyn fod yn anodd, ac mae llawer o bobl yn gwneud sawl ymgais cyn llwyddo.