Smokers with Macs: help is on the way.
"I have never considered leaving this post."
In a rare video address to the Japanese public, the 82-year-old said he feared his deteriorating health is preventing him from carrying out his duties.
The former London mayor unexpectedly announced he would not run to succeed David Cameron, who quit last week after failing to persuade British voters to stay in the EU.
It actually makes a lot of sense.