From Safer nicotine wiki
These parameters are deprecated. If the source that they name is important to the Wikipedia article, create a separate cs1|2 template for that source.
- lay-url: (deprecated) URL link to a non-technical summary or review of the source; the URL title is set to "Lay summary".
- lay-source: (deprecated) Name of the source of the lay summary. Displays in italics and preceded by a spaced endash.
- lay-date: (deprecated) Date of the lay summary. Displays in parentheses.
- lay-format: (deprecated) File format of the work referred to by lay-url; for example: PDF, DOC, or XLS; displayed in parentheses after lay summary. HTML is implied and should not be specified. File format annotation is automatically rendered when a PDF icon is displayed. Does not change the external link icon. Note: External link icons do not include alt text; thus, they do not add file format information for the visually impaired.