A small butane lighter that’s the size and shape of a cigarette. That’s what this is. It even looks like a cigarette! Buy a new pack of cigarettes, take one out, light it with this lighter, then put the lighter BACK IN THE PACK!!! That way, you’ll always have a lighter with you but you won’t have to give up precious pocket space.
It’s a simple $1.50 solution to a not-so-complex problem. You’re on your own as far as finding somewhere to smoke is concerned, as you can no longer legally smoke inside, outside, underground, underwater, or in the future — only back in time and inside a smoking helmet.