"Cannabis has been linked in a dose-dependent manner with elevated rates of myocardial infarction and cardiac arrythmias. It is known to affect bone metabolism and also has teratogenic effects on the developing brain following perinatal exposure. Cannabis has been linked to cancers at eight sites, including children after in utero maternal exposure, and multiple molecular pathways to oncogenesis exist. Conclusion. Chronic cannabis use is associated with psychiatric, respiratory, cardiovascular, and bone effects. It also has oncogenic, teratogenic, and mutagenic effects all of which depend upon dose and duration of use."
From
including children after in utero maternal exposureChronic toxicology of cannabis
Source: CLINICAL TOXICOLOGY Volume: 47 Issue: 6 Pages: 517-524 Published: JUL 2009
And let go to the third sentence; "including children after in utero maternal exposure"
So mother's smoking marijuana has been shown to give their unborn children cancer and in particular: childhood neuroblastoma (OR = 1.8, 4.7),126 rhabdomyosar- coma,45 and leukemia (OR = 11), particularly non-lymphoblastic leukemia,127 in cannabis-exposed pregnant mothers
If thats not evidence I don't know what is.