The latest study of methamphetamine (and other illicit drug) use has again declined, as shown in the latest CESAR study. See the table below:
These data are consistent with the earlier observation that the panic surround methamphetamine is just that.
By the way, here is a link to an enormously detailed review of the literature on methamphetamine, entitled A Key to Methamphetamine-Related Literature".
The latest data on meth use from the 2005 National Survey on Drug Use & Health is available in the table below. The source of this table is also cited below. The description of the study design is technically written but fairly easy to understand. To obtain the data on self-reported drug use they use in-person confidential interviews with a representative sample of U.S. citizens, with a few known exceptions.
The study states:
The rates for past month and past year methamphetamine use did not change between 2004 and 2005, but the lifetime rate declined from 4.9 to 4.3 percent. From 2002 to 2005, decreases were seen in lifetime (5.3 to 4.3 percent) and past year (0.7 to 0.5 percent) use, but not past month use (0.3 percent in 2002 vs. 0.2 percent in 2005).
We have purposefully restricted attention to meth use, not other stimulants.
2005 National Survey on Drug Use & Health: National Results
Appendix A: Description of the Survey