One (Large) company in the UK years ago - "Our psychometric tests indicate that you are possibly a smoker and we are a no smoking organisation"

Have never even held a cigarette in my life let alone smoked one

Tests included questions like "Johnny had a joint on Friday after work, is he OK to work on Monday?"

"Do you think smokers work to equal levels as their non-smoking employees"

and so on

Pretty sure this was illegal but I was young and had no idea so meh