He is the co-editor of "Police Suicide: Tactics for Prevention, " which advocates peer support and stress management programs and emphasizes the importance of mental health treatment and a culture in which asking for help is not seen as a poor career move or a sign of weakness.

CNN: Cops, suicide and a father's cause

He added in some mental health services there was a culture in which smoking was acceptable.

BBC: NHS 'ignoring smoking in mental health patients'

People keened about mental illness, guns and gun culture.

FORBES: The End Is At Hand

Smoking has become engrained into the culture in many institutions caring for people with mental health problems and making them totally smoke-free environments should be a priority, it concluded.

BBC: NHS 'ignoring smoking in mental health patients'

We have to look at areas of education and mental health, as well as other areas of law enforcement, areas of culture -- as was asked earlier.

WHITEHOUSE: Press Briefing