I'd agree with the article in that people who smoke all the time, but not constantly, develop a reverse tolerance. It's when people are getting high three and four times a day that a tolerance develops. I remember being able to smoke an eighth like it was nothing, then one day I could suddenly get high off a few hits (reverse tolerance). After I started smoking joint after joint in one day, the high seemed to be getting less intense (tolerance). Know what I mean? About users who develop more efficient smoking techniques: that's exactly what I thought caused reverse-tolerance. This, and reverse-tolerance make sense, since most people don't get high their first and second times.