For the majority of drinkers, the only switching or change in use is likely to be alcohol related and largely an adaptation of existing behaviour.
Ar gyfer y rhan fwyaf o yfwyr, mae'n debygol mai mewn perthynas ag alcohol y gwelir yr unig newid o ran defnydd ac, i raddau helaeth, addasiad o hymddygiad presennol fydd hyn.