For that, they need to have a romantic relationship. Sims with the sugar baby trait can ask sims to become their very own sugar daddy/mommy. This will earn the baby lots of simoleons! This mod adds a sugar baby and sugar daddy/mommy dynamic to the game! These come in the form of traits, each available for ages Young Adult to Elder. It will be very hard for them to quit, and easy for them to regain the habit!
If your sim smokes, they will gain an addiction buff. This mod brings smoking cigars and cigarettes to the otherwise innocent world of The Sims 4.