This statement, that babies whose mothers smoke marijuana while
nursing become addicted to marijuana, is unsupported by anything.
Children tend to use the drugs their parents use, alcohol, tobacco,
marijuana or others or all the above because children learn by
imitating their parents, not because they get tiny amounts in
breastmilk.  Furthermore, there is no evidence at all that marijuana
is addictive.  And no evidence either that it is as risky as alcohol
or tobacco.

Jack Newman, MD, FRCPC