Cigarette ends and pollution, Nantes, Loire-Atlantique (44)

I find this very interesting. An amateur notice tells me that one cigarette end can pollute up to 500 litres of water. Although I've no proof of this, it nevertheless sounds impressive. Le jardin extraordinaire is a non-smoking zone, even if it is outdoors. I applaud this, as I applaud any action against smoking: we have to realise which century we're living in, and smoking is a very dangerous part of our past.