Just today, I was trying to walk into MDCL and there was a guy standing less than a foot from the door, smoking. I often see people standing on the giant no-smoking sign painted on the pavement in front of the hospital, smoking. It doesn't help that they tend to put the ashtrays within a few feet of entrances. I agree that they really need to start enforcing that rule, or completely ban it on campus outright (which, based on the number of people on campus on a daily basis, including a ton of "visitors" through the hospital, isn't the most feasible/reasonable proposition).
I have a genetic disorder that essentially causes me to suffocate in the presence of second-hand smoke, especially if it's in a relatively enclosed area--these tend to be in entrances and areas where there is some sort of roof keeping the smoke in. I literally can't extract enough oxygen from the air because all the other sh*t preferentially binds to my ******* up hemoglobin. It's actually less harmful for me to hold my breath for the ~20 seconds it takes me to enter the building, because it takes less time to recover from that than to get the second-hand smoke out of my system.
So, yeah...designated, well-ventilated, enforced smoking areas that are not in high-traffic areas.

**for clarification, that's not the only effect of my blood disorder...but pretty much all the effects are due to lack of ability to uptake and transport oxygen. I'd be the first one down if exposed to carbon monoxide, too, not just second-hand smoke.