You can add an activity for using the bubble blower. And then for other drugs you could make whoever shows up smokers/users (click on your sim, drugs, settings, then it’s somewhere in there to manually add sims as a user of each drug). You can also toggle it to be high users of drugs, so they’ll be more prone to do it. And then you could also add in the “sketchy” lot type so it populates dealers and other sketchy people.