[DanBC]

It's not particularly surprising, but it's good to have the evidence.

> Huddled masses of patients smoking outside are fixtures of most psychiatric treatment facilities.

It's a bit more complicated than "self treating with nicotine". A number of people go into hospital as non-smokers and come out as addicted smokers.

Smoking cessation combined with decent occupational therapy is important to reduce harm.

The knee-jerk banning of vaping in many hospitals is a bit worrying.