Driving a car. Not necessarily your own life expectancy. https://www.who.int/news-room/fact-sheets/detail/road-traffic-injuries
Voting Republican.
Invading the Ukraine.
It's Ukraine, without "the". "The Ukraine" is the soviet name, which Putin likes to use.
Poor diet and exercise. Absolute top above everything else. Heart disease is the number one killer worldwide, and heart disease can be prevented in most people by a clean diet AND exercise. You need to do both, more of one doesn't make up for lack of the other.
(Well, aside from doing objectively dangerous things, like using dangerous drugs, going insanely fast on a motorcycle, or playing Russian roulette every day.)
Dying
Really makes you think
We're actually all slowly dying as we speak. Your life is literally killing you
'He says he's dyin', I suppose he should know.'
'Dying of what?' said Masklin.
Dyin' of bein' alive for such a long time,' said Granny.
- Terry Pratchett, Truckers
Have you tried not doing that? Worked pretty well so far.
Strange. Why is everyone posting all of my plans for the next 5 years?

5 years? I like your optimism.
Erotic asphyxiation
Also the kind with cars
Physical idleness, overeating, smoking, drinking. You can dodge a lot of the risks just by never getting fat, staying active and being moderate/sparing with food, drink, and drugs.
Gluttony and sloth. I would also say wrath, being mad all the time is bad not just for those around you but also hard on your own body.
I like riding my motorcycle
What do you ride? I see your sail boat, you got a picture of your bike too?
Hell yeah brutther I'm riding a Yamaha Super Tenere, gave up the liter bike after thinking OP's same question, here's a picture on some trails I had no business being on with those tires. 
It's a beaut. Thanks for the share.
I've always wanted to try a dual sport, but I don't think my legs are long enough. They always look super tall (compared to my bike).
They are definitely tall
I'd say 'keeping up with the Joneses'. Getting tangled up in that whole stress trap is so innocuous that many people don't appreciate how bad it is to push it all to the point that an affluent household is 2 paychecks away from destitution. It's just some cultural thing that keeps people awake at night and to even address it with candor is verboten
Never understood that mindset, if anything I do the opposite. Insist on doing it for less.
You spent £500 on a hipster campfire. I made a fire hole for nothing.
Smoking, drinking, and obesity
Eating the normal highly processed foods (here in the USA) and parallel with that, not exercising
Wingsuit flying.
There was some "research" done on this. https://xkcd.com/369/
I want to see these gardening accidents
smoking, drinking, cars (pollution etc)
Riding a motorcycle, especially without proper gear.
Telling other people what they should NOT do.
Expecting, or pursuing the establishment of, human rights as a subjugate group or "subordinate" class.
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