Can I bring an open pack of cigarettes on the plane?
I don't want to use them, but travel with them. Can I carry on or checked bagage or what?
Yes, assuming they are legal cigarettes, you can carry them on in your shirt pocket, carry on, whatever.
They've just recently lifted the ban on disposable lighters also. You can not bring a zippo style 'fill and use' lighter, but a sealed disposable lighter is now allowed.