“Elder Scrolls: Oblivion” has its stuttering, jittery skooma addicts. “Haze” has its soldiers pumped up with nectar to enhance their combat abilities. “Grand Theft Auto 4” has Jacob, a Rastafarian who is constantly smoking weed. Even Mario had a taste for mushrooms that made him grow and flowers that let him throw fireballs! The hue and cry to eliminate the influence of drugs from video games has gotten louder, and the specter of censorship looms over the industry.