Well, take advertisements for an example. All over the back of magazines and inside them I see adds for various drinks, beers, and they're all "pretty". They're colorful, they show beautiful, attractive people using them, and the colors and artwork behind it is amazing.
Whenever a celeb does drugs, it makes the people that celeb targets think drugs are okay. Take Justin Bieber for example. Also in magazines it shows smoking and drinking is glamourous and in songs that drugs are how that person got famous. (Rap)