I doubt all these smelly things will still be with us in ten years time, thanks to their health risks. They emit volatile organic compounds that are known to cause at the very least, irritation of the respiratory system and at the worst, real bad stuff. There are plenty campaigns to have them banned from public places.
Now with the focus on air pollution, every single possible culprit is being scrutinised. I pray these things get the chop.
Worst of the worst is staying in a hotel or guest house where they've activated those stinky bottles of perfume that you plug into an electrical outlet. Or those bottles of the stuff with those reedy things dipped in them. I also don't get those things people hang in their cars. Why? Why not just open the window and let whatever smell's in there out? And if you are a smoker and your car stinks, well, suck it all up. You've paid for it.