Asphalt made of cigarette butts paves the road to less litter

Asphalt made of cigarette butt...
Discarded cigarette butts could soon be locked away inside asphalt roads and paths
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Source: RMIT University

This is a good idea, butt...Sorry couldn't resist! The bricks are lighter in weight. Where are the butts collected from? Does someone trawl the pavements?
Another idea: grind up waste plastic and use as aggregate in clay bricks.
Hey ! Go on smocking guys (I'm kidding) Great idea, why not used tires ?
The problem with asphalt, surely, is that it gradually wears away from constant friction. Therefore the toxins would be gradually released over time and would enter groundwater.
Encapsulating in bricks is probably a better way, although bricks need to be cut and drilled as required. I hope we can find a better way of disposing of them- although, happily, in the Western World at least, cigarette smoking is very much on the decline.
A similar method was applied by adding sawdust to the clay prior to firing many decades ago in Australia. Since no industrial acceptance was achieved all those lightweight and insulating bricks were exported to a USA client and nothing more was heard about this endeavor. Generally it takes around 50 years for a new technology to be accepted by the building and construction industry.