Well many people say drugs are pretty useless now, altho the red screen is fun too, i have got an idea.
Weed makes u feel happy and numb irl, like sometimes u wont feel punches or anything.
So what about make it give u about 10-20% more health.
So an example would be:
1 gram of weed would give u 10% more health for 15 minutes (each gram ontop of that would give it more minutes)
1 gram of heroin would give u 15-20% more health for 30 minutes(each gram ontop of that would give it more minutes)
These are just examples of percents of health+ amount of time, can be edited ofc.
Perhaps it could be shown as armor, so its probably easier to script.
I have no idea if this is easy to script overall tho, but let me know what u think about it

Greetz,
Cyc.
P.S: this could be combined with the hp u lose after it, so u could actually die if u want more health/minutes.
Its like a quick boost just like real life

P.S.S:Seeing the medic job, maybe medics could remove the drugs used on you, so u will lose the health buff, but u will also disable the lose 5 hp after use effect.
In this case overdoses could still be cured
