Chronic as defined by Websters is

1: "marked by long duration or frequent recurrence"
2: "always present or encountered"

So I would like to avoid the troubles of chronic use that is mentioned often but I am having a difficult time finding what chronic is. The closest thing I have now is 7 days use of clen with at least a 7 day break (Pharmaceutical Phenotype Enhancement: Clenbuterol Part I).

Would that be the equivalent of 2 weeks use of ephedrine with a week off do to the short term duration? I'm interested in using it two or thee weeks at a time with two weeks off. Just seeing what I can get away with without entering chronic use.