You had the "Shit people my age die and it's not that uncommon an occurrance" moment of clarity? A couple of years ago I realized I'm well past the age our cavemen ancestors averaged in lifespan - about 35 years - and from here on in I'm of an age where peoples death certificates read
'natural causes' 
. Sort of had a crisis of being old with the whole 3MeOPCP affair, proved to myself my number could be called at a moments notice and have since set about identifying the most harmful aspects of my lifestyle and eliminating them; hence the zero ketamine intention. Next it's stimulants (who's use I've rather increased over xmas & new year) and that'll leave cannabis & psychedelics, which I have no intention to give up for the foreseeable future (might even get Savitex/medical cannabis prescribed by the pain management clinic for phantom limb pain

) as they have a positive effect on me; a lot of this change has been brought about by psychedelics and they're fairly benign physically so I see no reason to stop (I don't mean entactogens such as MDMA, which I have no desire to take for the most part, but are more harmful than the traditional psychedelics such as LSD)
To quote Inspector Drefuss (Herbert Lom) from the Pink Panther films (think it's Revenge of the Pink Panther), "every day, in every way, I'm getting better & better"!