Medieval Scottish highland tobacco cultivated between the years 550 and 575 and locked in an airtight time capsule buried hundreds of yards underground in a remote waterlogged bog is ideal. You will have to make the journey yourself, though, and outmaneuver the throngs of other pipe smokers who are in search of this elusive product. It will be expensive, exhausting, and you may wind up with a variety of infections, parasites, battle wounds etc. when all is said and done. I would meticulously read the fine print of your life insurance policy before embarking on such a mission, and refrain from blabbing about it on social media as much as possible.
Or, something mellow from Mac Baren, whatever. ?