Cigarette smoking is associated with a number of illnesses including cancer, oral disease, heart disease, stroke, pregnancy complications, and chronic obstructive pulmonary disease (COPD) to name a few
The idea is essentially a playful nudge to do the right thing and the competitive element gets people to be conscious and thoughtful while discarding cigarette butts without even thinking about the impact of what they are doing
Who wants this in their grid
A 2018 report by the US National Academies of Sciences, Engineering, and Medicine concludes, [w]hile it is biologically plausible that nicotine can act as a tumor promoter, the existing body of evidence indicates this is unlikely to translate into increased risk of human cancer. (Wikipedia) I conclude that persuading people who smoke to switch to vaping does almost as much good as persuading them to quit entirely, hence that for anti-smoking groups to emphasize the dangers of vaping, as they do, is probably a mistake if their objective is to reduce the number of smokers