My son has severe learning difficulties. I made it very clear that staff in his flat MUST NOT SMOKE in the flat. After all, they are in someone else's home. It should be a requirement of their employers that they don't smoke, after all, Roy Castle died from lung cancer caused by "passive smoking". He didn't smoke but worked in clubs where smoking was allowed. I suggest you talk to the LA funding your care to start with, and make sure "No Smoking" is part of his care plan.