No, don't we have enough people getting stoned already? As far as being addictive, all that has to happen to know for sure is if something is addictive are withdrawal symptoms. By the way your source is old and as most people know people using always deny the substance is addictive.
The following was in the news recently:
"... studies have shown that when regular pot smokers quit, they do experience withdrawal symptoms, a characteristic used to predict addictiveness. Most users of more addictive drugs, such as cocaine or heroin, started with marijuana, scientists say, and the earlier they started, the greater their risk of becoming addicted".
"...Marijuana today is more potent and therefore more toxic than marijuana grown in the 1970s, Volkow says. Back then, she says, plants typically contained only 2% THC. Today, she says, marijuana plants typically contain 15% THC".