Actually there is no mass wave of federal retirements although it has been predicted for some years now. And with fewer and fewer feds covered by the old retirement plan which made retiring at age 55 very attractive… not to mention inflation which is just getting warmed up… I dont expect to see one.
There are a lot of people with clearances who used to smoke weed… they just had to stop their use well before applying; also helps if they were not chronic users. I dont see a vast new pool opening up. But overall @Weeble is correct, the standards are changing and I expect them to change more over the next couple years.
But just as excessive alcohol use/abuse is a concern, there will be a similar standard for legal marijuana use.