Sitting is the new smoking

[Glen]

Fitness experts try to get us up on our feet moving around, saying in effect that sitting for long periods of time can be as harmful to our bodies as can be the habit of smoking.

El sentarse ahora se considera tan dañino como el fumar
Sentarse perjudica la salud de igual manera del fumar
Sentarse y fumar, el mismo daño le da
Considerar que el sentarse equivale al fumar

Which one?

[Rusty]

Sentarse es el nuevo fumar.
Sentarse, el nuevo fumar.

Sentarse es tan malo como fumar.

[ookami]

Fitness experts try to get us up on our feet moving around, saying in effect that sitting for long periods of time can be as harmful to our bodies as can be the habit of smoking.

El sentarse ahora se considera tan dañino como el fumar
Permanecer sentado [por largos periodos] se considera tan dañino como fumar

Sentarse perjudica la salud de igual manera del fumar
Estar sentado perjudica la salud de igual manera que fumar

Sentarse y fumar, el mismo daño le da
Estar sentado y fumar: el mismo daño

Considerar que el sentarse equivale al fumar
Consideran que estar [mucho tiempo] sentado equivale a fumar

Which one?

I wrote in red how I would say those headlines.

For me to use "sentarse" seems wrong.
"sentar" is an action that takes place in a short period of time, just a few seconds... like "to take a sit". And what is wrong for health is "sitting for long periods" that would be "estar/permanecer sentado por mucho/largo tiempo"

[Glen]

Thanks ookami, very helpful indeed.