A third of women aged 16 to 19 were recorded as smokers at initial assessment compared to one in ten women aged 30 or over.
Cofnodwyd bod traean o fenywod rhwng 16 a 19 oed yn ysmygu yn yr asesiad cychwynnol o’i gymharu ag un o bob deg o fenywod 30 oed neu hŷn.