Comment on

• Active enforcement of cigarette control laws in the prevention of cigarette sales to minors.

  Jason LA, Ji PY, Anes MD, Birkhead SH. Jason LA, et al. JAMA. 1991 Dec 11;266(22):3159-61. JAMA. 1991. PMID: 1956104
• The effects of combining education and enforcement to reduce tobacco sales to minors. A study of four northern California communities.

  Feighery E, Altman DG, Shaffer G. Feighery E, et al. JAMA. 1991 Dec 11;266(22):3168-71. JAMA. 1991. PMID: 1956106