Thanks lawbird but that's not how it will work.
All the premises will effectively operate as normal homes.People can come in if they want to and if I want them to(smokers only).Alcohol,soft drinks and food will be available but not sold as such.This will be covered by the entrance fee.
Basically,it will be little different to holding a house party every day.I can allow entry to anyone I want to,drinks and food will be served to my 'guests' and smoking is not against the law in these circumstances.
As far as employees are concerned,if a home owner employs a cook or servant,it clearly is not against the law for the home owners and any guests,to smoke.
I look forward to hearing your further views on this.