I do not see necessity to deprive sugar, salts or fat food… I am assured - a healthy organism adjusts its needs by itself. A typical example: fast and sudden varying predilections of pregnant women, and desire simply arising sometimes to eat this or that product… So have to eat that our organism wants. And we have to go in for sports to live long and healthy life!

Smoking

I would tear off those heads who smoke in public places. Or, as in case of with cars would determine a norm of the CO maintenance in "exhaust"! And to those who does not keep within norm - to implant the catalyst. That all cigarettes muck to remain inside the smoker organism – why should they poison our environment!