Here is a passage from a report on today's www.sciencedaily.com:

"Candida albicans, a type of yeast present in 80 percent of humans, is
usually harmless. In otherwise healthy people, it can cause mild oral
and vaginal infections (candiasis or thrush) that are easily treated.
But in people whose immune systems are suppressed (by AIDS,
chemotherapy, or drugs for surgery or organ transplantation) it can
produce deadly, systemic infections, causing death in 30 to 50 percent
of cases. Premature babies, whose immune systems are immature, are also
at risk."

Link: http://www.sciencedaily.com/releases/2006/07/060721200644.htm

Now no "mainstream" doctor or scientist would disagree with this
statement.  However, let us use basic logic here.  If am a doctor, I do
not follow my patient's around to determine what they are doing to
their bodies.  If I am a typical doctor, I ask a few questions of them
and review their charts.  Most people who do massive amounts of illegal
drugs are not going to reveal this fact to their doctors.  Moreover,
even if they did, few in fany experiments on the effects of various
combinations of illegal drugs on humans have been conducted.  Thus,
there is no way to know if various combinations of illegal drugs being
used by many "high risk groups" for "AIDS" have severe
immunosuppressive qualities.  Even fish oil supplements, if taken in
high, but not uncommon doses, can, in fact, have strong
immunosuppressive effects.  For example: "...the anti-inflammatory
effects of FO may be explained in part by a shift in the Th1/Th2
balance, due to the direct suppression of Th1 development, and not by
enhancement of the propensity of CD4+ T cells to be polarized toward a
Th2 phenotype..."

Source: J Nutr. 2005 Jul;135(7):1745-51.

Those of you who are familiar with the "HIV/AIDS" literature understand
the significance of such a finding.  And how many of you think that a
person doing all kinds of illegal drugs in large doses is living a less
immunosuppressive life than someone "supplementing" with several grams
of fish oil each day?  Again, let's have just a tiny bit of logic here,
please, for the sake of humanity (and not BigPharma profits).