Smokers could also contribute live weather reports. I've seen those dedicated beasts standing outside in blizzards to get some of that sweet, sweet nicotine.
I think most modern cigarette smokers have trained themselves to ignore what's written on the package.
If dad sees his own face on a pack will he feel guilty and finally come home?
Or dog food tins because it's always dog walkers who discover dead bodies.
I drink milk outside because I am lactose intolerant but addicted to homogenization.
That's actually a decent idea. I'm afraid it'd create positive connotation of smoking though so it probably won't happen.
In Australia they put photos of things that are missing, like toes and teeth, and people who are [permanently missing. ](https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTSx2dN1YwXHGv8rVivWVLrKbagMp04omovGk5e1Ft7krjRwJDfBVBK6dqZ3Q)
That's honestly one of the big things I miss about smoking. Being outside any time, talking with other people about what the day's been like; it kinda feels like standing around a campfire, or grill.
Unfortunately I'm pretty sure the whole milk carton thing never really worked in finding anyone. But I'm giving you an upvote because your idea is better.