New York becomes the first state to require fire-safe smokes.
Cigarettes sold in New York state must go out if they're not puffed on regularly.
About 900 Americans die each year and another 2,500 are hurt by fires started by cigarettes left unattended.
For the past several months, tobacco companies have rushed to meet the deadline to supply vendors with the new cigarettes. They're wrapped in special ultra-thin paper that essentially inhibits burning.
But Ellen Matthews, a spokeswoman for R.J. Reynolds, says the cigarettes shouldn't lull smokers into a false sense of security. The cigarettes can still cause fires if handled carelessly.