[Adverse effects of marijuana in children: Could its knowledge limit the legalization of drugs in Mexico?].

A reflection on whether to expose, determine and clarify the effects of marijuana on pregnant adolescents and their fetus is a determining factor to consider more judiciously the tendency to legalize marijuana in Mexico. We emphasize alterations in the central nervous system, immune system and some genetic aspects of the fetus and its potential expressions at different stages of a child's life. Should pediatricians and parents allow, in addition to the difficulties that their patients and children face today, the risk that is the affordability of marijuana? That is the challenge to overcome.