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One possible trend that may be causing the increasing tendencies of drug use among youth is that marijuana is more readily available to teens than it has been in the past. According to an article in the Washington Post, "availability is the mother of use" (Califano). As a result of the increase in availability, teenage use will also increase. To demonstrate, a CASA survey found that forty percent of twelve to seventeen-year-olds reported that they could purchase marijuana within one day. Increasingly, twenty-one percent of teens reported that they could have access within one hour (Califano). However, while these rates seem surprisingly high, they are not necessarily a large enough increase to cause the sudden jump in teenage drug use.