10 seconds is all you need (...or want)

So after throwing a few more words in the box, I came upon a site which actually showed that holding your smoke in too long allows deposits of particulate material to buildup. This proves well enough that you can hold your smoke in too long. But, this still left one question unanswered; How long do I need to hold the smoke in to get nearly all the goodness, and still breathe out some of the tar? Google was going nowhere, so I went to MAPS, and found that their search was actually powered by Google. So, the best link the search turned up was an unanswered (go figure) question post from 1999, asking:

1) Have more studies been done regarding this?

2) Can someone provide me with abstracts or summarizations from the report I have not been able to find?

3) Can someone try to summarize the body of evidence? (From what I've read, it seems that holding the smoke for just one second gives just as much effect, but reduces the danger, in lowering absorption of CO.)

Well, in the time since the question was asked, the access of information has become quite a bit simplified. I was able to follow one of the references which seemed to fit my quest perfectly:

Azorlosa[1], J. et al., "Marijuana Smoking: Effects of Varying Puff Volumes and Breathhold Duration", /Journal of Pharmacology and Experimental Therapeutics/ 272: 560-69 (1995)

Now, I was not able to read the article in question (for free), but after looking at several articles that referenced it, I found the general consensus of the articles, and what I wanted to know, was this:

Inhaled THC is well absorbed after a brief interval, and subjective high and serum THC levels do not increase beyond a maximum 10-second inhalation (Azorlosa, Greenwald, & Stitzer, 1995)

There you have it. Hold it in for about 10 seconds, anything more and you're doing more harm than good. I know I'm going to have to change my smoking habits now.