My brother's high school friend died from lung cancer three years ago. He was 24.
He grew up in a house where both parents smoked, but he never touched any smokables in his life.
This doesn't invalidate your point that walking past somebody smoking outside (how much more ventilated can you get than BEING OUTSIDE?) is significantly safer than being in a smoke-filled room indoors. I just wanted to give one example where it is believed that 2nd hand smoke probably contributed to the death of someone who did not WORK around smoke.
Anyhoo, I applaud smokers for smoking outdoors, but it just really sucks for the rest of the population who finds exposure to it PHYSICALLY offensive to have to walk through a cloud of smoldering tar every time they want to enter a building.
One of my hobbies is making fishing lures. To make the soft plastic fishing lures, I have to heat a product usually refered to as "plastisol" to 350 degrees, via hot plate or microwave. During this process, carcinogens in the form of vapors are produced. While dangerous, it has shown to be safer than smoking, but I still wear a vapor-protection mask and would NEVER subject my neighbors to it. I only pour outdoors, on my GF's parents' private land where THEIR nearest neighbor is about 5 miles away.