If you smell something, it means there are some particles or droplets in the air. We inhale them.
Its good that smoking doesn't regarded as harmless anymore. Yet its difficult to avoid the second hand smoke. Very often here in Newtown, when I'm at the playground with my kids, I can see a mother and a father with a pram coming, sitting on the bench and... starting smoking. Or it rains cats and dogs, we are waiting at a tiny bus shelter and suddenly a person next to us is starting smoking... Its not so much the government to blame but the people who doesn't care if they cause discomfort (headaches, coughs, etc) or even are harming others health.
And its not just cigarette smoke. I remember starting to have a terrible headache several times when somebody next to me obviously used lost of synthetic perfume in public transport or gym. Its probably just as harmful. And all this room-fresheners, tumble-dryer additives etc.
Anyway, its such a joy to create an unique smell with natural essential oils instead of buying something with ingredients totally unknown to you. And there are plenty of books with recipes for this in libraries.