It's worth reading his humane, thoughtful piece in full, but to summarise, he lists the four ways we die: "Sudden death; the long, slow death of dementia; the up and down death of organ failure, where it's hard to identify the final going down, tempting doctors to go on treating too long; and death from cancer, where you may bang along for a long time but go down usually in weeks".
Smith argues that, provided pain relief is available, cancer is the best option. It is the only death that leaves us in a position to make our peace with those we love and to tidy up loose ends.
The alternative he proposes is to live each day as though it's your last. To too many people that means cramming as much self-indulgent bucket-list trivia into every waking moment as they can, as though your biggest regret might be that you didn't take that balloon flight over the Grand Canyon rather than that you hadn't reconciled with that estranged parent or child.
One of the saddest things I've seen was a documentary about people with terminal cancer. The person who was fighting hardest was the one who should have been most accepting because she was a devout Catholic who believed death would take her to Paradise. But she had never had a partner, children or a career and had no friends except the people she knew through church. She was going to die never having lived. And she wasn't happy.
So to Smith's advice I would add the most important thing you can do to prepare for death is to make sure you have had a life.