出典:Wikipedia
出典:『Wikipedia』 (2011/02/08 01:30 UTC 版)
This section has no citations, contains questionably worded statements such as "to make matters more complicated", and is ignorant as to the concepts of necessary and sufficient conditions. To clarify: No versions of Gateway Theory would claim marijuana use is necessary for abuse of harder drugs, as the existence of heavy drug abusers who have never used marijuana immediately invalidates such a statement. Furthermore, no versions of Gateway Theory would claim marijuana use is sufficient for abuse of harder drugs, as the existence of marijuana users who have never abused heavy drugs immediately invalidates such a statement as well. Rather than complete removal of this section, I will “clean it up” and request the original poster cite the claims they have made. If this is not done in a timely fashion, removal may be necessary (as is the case for any material of questionable origin and without citation on Wikipedia). —Preceding unsigned comment added by 68.34.100.119 (talk) 19:35, 23 April 2010 (UTC)