"Smoking outside the main doors"

I read with interest the reply to a complaint about smoking outside the main doors of Southmead Hospital in Bristol. Having had a blood transfusion last week, my husband needed to sit down on the benches outside. We had to wait for the shuttle bus. Suddenly a blue cloud of cigarette smoke engulfed us both. A woman on the next bench was smoking. I suffer from asthma and cigarette smoke is my main trigger. We pointed out the many, many no smoking signs but she replied "Everyone does it". I approached a security guard standing nearby who said" If we have to tell one, we'd be telling people all day". By this time I had used my inhaler 3 times. I had to use it another 3 times on the shuttle bus, and then had an asthma attack outside the car park. We had to return to the hospital 2 days later and there were more people smoking in full sight of the security guards who, by the way, just stand around most of the time. Surely there should be an enforcement officer at the very least?