Extensive testing (by ChemCentre) has found that the actual contents of Kronic found in Western Australia (WA) varies even though the packaging may look the same, therefore it is difficult to be certain of the health and legal outcomes for each product. Further testing has shown that these products in WA can contain active components other than synthetic cannabinoids such as MDPV, 2CI, methylone (3,4-methylenedioxymethcathinone), dimethoxy-allyltryptamine (DALT) and phenazepam. These mixtures of compounds with different pharmacological actions can have unpredictable results when taken. http://drugaware.com.au/Drug-Information/Cannabis/Synthetic-Cannabis.aspx several of these synthetic cannabinoids have methamphetamine like effects upon circulation (increased blood pressure, association with stroke). As the reports of stroke with marijuana have been mostly RECENT, At the TIME WHEN SYNTHETICS ARE COMMON. I suspect the main/only circulatory risk is with the synthetics. BUT both are likely to be VERY BAD for a developing fetal brain. Every time ANYTHING has been shown to be bad for adolescents it has been FAR FAR worse for developing fetus (heck, my green teeth from tetracycline deposits, sunlight and melanoma risk in teens..worse in 5 yr olds) So, brain effects from marijuana in teens (lower IQ) likely to be really bad in fetus.