Mae mwy o berygl i gyn-ddefnyddwyr heroin ddal y coronafeirws, gan y bydd ganddynt systemau imiwnedd gwannach a bydd gan lawer ohonynt gyflyrau iechyd isorweddol eraill, a hynny o ganlyniad i gamddefnyddio sylweddau.
Former heroin users are at greater risk of contracting coronavirus because, as a result of their substance misuse, they have poorer immune systems and many will have underlying health conditions.