My Mum was taken quite ill a couple of months back so had to visit the main hospital in aberdeen. The main door was always under a cloud of fag smoke, the side door was also stinking of cheap smoke yet the smoking shed was mostly empty. At times walking thro' the main hall you could still smell the stench.
Nobody said a word about that, despite the signage that you can only smoke in the shed.....
The other hospital she is now in, again, right by the main door, patients and staff puffing away. Not a word said.
But I did meet 3, aye only 3!, vapers. So a pleasant few minutes discussing kit and blowing custard clouds.
So, the NHS boards can ban from their sites what they want, but most people, going by the amount of smokers still puffing away near the main doors, ignore the bans.