Even if you were 17 you could still buy lighters. Now I went to a smoke shop once when I had 'forgotten my id' also (years ago). But I was only planning on buying a butane torch lighter (for salvia). I tried to buy it and they carded me??
But then the next day I went to the grocery store and bought a pack of bics, and the clerk was looking at his screen and said, "Well. It's not telling me you need an I.D, so your good."
Maybe it's illegal to sell lighters to persons <18 at specialty stores or something?
Anyway I'm saying you shouldn't need an ID to pick up lighters, just go to the grocery store or gas station. Also, move out of your house. Your fucked until you do so, and you can't really complain until you do so.