"Staff smoking on a “smoke free” site"

I visited the hospital site for my early morning appointment very early due to the parking issues on site. I parked next to a member of staff who was smoking on a "smoke free" site. I had my child with me who himself complained about the smell of smoke and how it made him feel sick. My car windows were closed and we could still smell their smoke. Upon exiting my vehicle I noticed they had dropped their cigarette end on the ground. I’m happy to be contacted for the staff member's vehicle registration number. This is not acceptable!