For most of my childhood, cigarettes were simply part of the scenery. They were everywhere—family gatherings, restaurants, bus stops, university campuses. Someone was almost always smoking, and everyone else was breathing the smoke. That was simply how life looked. I didn’t like cigarettes. I hated the smell, and as a child I had a rather creative solution to the problem. I thought someone should invent a smoker’s helmet—a fully enclosed helmet that kept every puff of smoke inside so the smoker could enjoy it while the rest of us enjoyed fresh air. I was quite convinced it was a brilliant invention. Sadly, no one seemed interested in investing. But if…