Mmm. Just as a note, Szoreny as I wrote him isn't "fun" drugs. For him, the heartsap mechanic (which is poisoning yourself with mercury) represents both the self-destructive effects of his envy and performance-enhancing drugs. Szoreny isn't the junkie partying - he's the East German Olympic athlete wrecking his body with steroids and blood transfusions, all to eke out extra performance to
win. He's the student who's taking so many caffeine pills he's given himself heart palpitations because he has to keep working through the night. He's the supermodel injecting botox into the back of his hands to stop wrinkles showing there, and constantly getting plastic surgery in pursuit of an abstract concept of beauty. He's Bane, shooting up with Venom to try to kill the Bat. Because you've got to be the very best, like no one ever was.
Then there's mechanics for getting the heartsap out of your system by beating your rival, which means Szoreny's encouraged to set up a climatic showdown with his rival, rig the fight, and then activate all his Accumulation keyworded charms [1] to get that victory, so when he wins, the moment of victory purges his system of the poison. Of course, if you don't win, you're now suffering for weeks.
Hmm. Explaining it like this, yeah, I think it's better that heartsap should be able to take you down to Incap. You can't kill yourself with it, but you can put yourself in a coma and things'll hurt so badly you wish you were dead. And sure, you can stop taking heartsap... but then all those Accumulation-keyworded charms you bought are going to waste, so maybe you'll just use them in, uh, emergencies. Yeah, emergencies.
(
@Revlid's ideas for Hegra sound more in line with the fun drugs stuff, because his concept for her is that she's the jaded decadent debutante who tosses a high value note between two homeless people and has them fight for her amusement, while being off her face with cocaine)
[1] the charms which put more heartsap in your system when you use them