Ok, this post is really freaking me out.
Have any of you done a Google Scholar or Pubmed search on marijuana and psychosis? I am currently studying schizotypal symptoms in college students who use this substance, and there is TONS of literature out there indicating that use, especially chronic and long term, changes the brain and can increase by many times your chances of having an episode of psychosis, especially schizophrenia. I haven't read yet about the impact on infants breastfeeding, but I'm sure this has been studied as well.
FYI, research also shows that kids who start using BEFORE the age of 17, a critical time of brain development, show worse problems in terms of deficits, higher likelihood of psychosis, etc. so I'm sure that if infants are exposed at all, the impact is even greater.
Think of it like this: the impact of cigarettes on children to the tenth power.
Please look online and read some research articles before making a decision that could seriously impact your future and your child's. A sick child is very stressful.
I think just about anything else would be better at stress relief...a quiet day off work babying yourself (hot bath, reading, etc.), staying home and nursing, taking a walk, mindfulness, etc. Or if it's that bad, perhaps find someone you can see for therapy only (without medication).
Here are some citations if you want to learn more:
Arseneault, L. C., M.; Poulton, R.; Murray, R.; Caspi, A.; & Moffitt, T.E. (2002). "Cannabis use in adolescence and risk for adult psychosis: longitudinal prospective study." British Medical Journal 325: 1212-1213.
Chang, L. Y., R.; Cloak, C.; & Ernst, T. (2006). "Marijuana use is associated with a reorganized visual-attention network and cerebellar hypoactivation." Brain 129: 1096-1112.
Drewe, M. D., J; & Riecher-Rossler, A. (2004). "Cannabis and risk of psychosis." Swiss Med Weekly 134: 659-663.
Dumas, P. S., M.; Bouafia, S.; Gutknecht, C.; Ecochard, R.; Dalery, J.; Rochet, T.; & d'Amato, T. (2002). "Cannabis use correlates with schizotypal personality traits in healthy students." Psychiatry Research 109: 27-35.
Ehrenreich, H. R., T.; Kunert, H.J.; Moeller, M.R.; Poser, W.; Chilling, L.; Gigerenzer, G.; & Hoehe, M.R. (1999). "Specific attentional dysfunction in adults following early start of cannabis use." Psychopharmacology 142: 295-301.
Hambrecht, M. H., H. (2000). "Cannabis, vulnerability, and the onset of schizophrenia: An epidemiological perspective." Australian and New Zealand Journal of Psychiatry 34: 468-475.
Henquet, C., R. Murray, et al. (2005). "The environment and schizophrenia: the role of cannabis use." Schizophr Bull 31(3): 608-12.
Jacobsen, L. K. M., W.E.; Westerveld, M.; & Pugh, K.R. (2004). "Impact of cannabis use on brain function in adolescents." Annals New York Academy of Sciences 1021: 384-390.
Moore, T. H. M. Z., S.; Lingford-Hughes, A.; Barnes, T.R.E.; Jones, P.B.; Burke, M.; & Lewis, G. (2007). "Cannabis use and risk of psychotic or affective mental health outcomes: A systematic review." Lancet 370: 319-328.
Pope, H. G., Jr.; Gruber, A.J.; Hudson, J.I.; Cohane, G.; Huestis, M.A.; & Yurgelun-Todd, D. (2003). "Early-onset cannabis use and cognitive deficits: What is the nature of the association?" Drug and Alcohol Dependence 69: 303-310.
Skosnik, P. D. S.-G., L.; & Park, S. (2001). "Cannabis use is associated with schizotypy and attentional disinhibition." Schizophrenia Research 48: 83-92.
Stefanis, N. C. D., P.; Henquet, C.; Bakoula, C.; Stefanis, C.N.; & Os, J.V. (2004). "Research Report: Early adolescent cannabis exposure and positive and negative dimensions of psychosis." Addiction 99: 1333-1341.
Veen, N. D. S., J.; ven der Tweel, I.; Feller, W.G.; Hoek, H.W.; & Kahn, R.S. (2004). "Cannabis use and age at onset of schizophrenia." American Journal of Psychiatry 161(3): 501-506.
Williams, J. H. W., N.A.; & Rawlins, J.N.P. (1996). "Cannabis use correlates with schizotypy in healthy people." Addiction 91(6): 869-877.