I was reading the DSM-IV manual. I found it interesting. When I read about substance dependency or cannabis dependency, a few questions arose. If one has been using for years off and on, wasn't problematic with work or family life, used it at an average of 3 times a week for six or seven years, and decided to make a complete stop of smoking the substance, and maintains abstinence for about 15 to 18 months, would that person be considered cannabis dependent? And as for the criteria for it. I know three or more is needed for dependency, but as for the issue of the criterion being in the same 12 month period, would that be for instance be the last twelve months, or at anytime during the lifetime history of use? And for cannabis abuse, would that be in the last twelve months for a diagnosis or at anytime during the history?