From the BBC:

The holes in Samantha Wilson's lungs are getting bigger.

There is no cure for her illness and if it continues to get worse it will eventually kill her.

Samantha is 37 and has emphysema, a progressive condition normally associated with older people who have smoked tobacco regularly throughout their lives.

Samantha's doctor, Dr Onn Min Kon, a consultant physician of respiratory medicine at St Mary's Hospital in London, believes her cannabis smoking may be to blame for her condition.

Dr Kon said he had several other young patients who smoke cannabis and have lung diseases normally seen only in older tobacco smokers.

He said: "I've got a collection of young people who have lungs that look like they're 65-year-olds."