The secondhand smoke posters can be printed inexpensively at any local printer/Kinkos/FastSigns, etc.

The posters can be printed on any type of paper you choose - plain, hard, glossy - the printer can show you the options.  The posters can also be laminated or placed on foam.

The posters should be printed at the following sizes:

Poster 1: 36"w x 24"h 
Poster 2: 24"w x 36"h
Poster 3: 24"w x 36"h
Poster 4: 24"w x 36"h
Poster 5: 24"w x 36"h

The size can be reduced if need be, but it may affect the clarity.  The printer can give you other size options.