I agree that jake would probably take up drinking, marco might try a few things after becoming a ballin hollywood movie star lol
But during the actual series, they probably wouldnt, but maybe they could have touched on them dealing with the darker side of society, like the yeerks are using a special drug to enslave the addict community or they're using a brothel to infest all its customers, stuff like that would be interesting to see the animorphs have to deal with