if by "herbs" you mean pot then i can tell you that the only negatives so far are just that you can become dependamt on it if you are using it for insomnia but i will also tell you that smoking pot can help insomnia greatly and is safer than popping sleeping pills that can cause liver failure or intestianal distress you can overdose on sleeping pills too if you're not carefull most strength pills like tylenol have 500mg of acetaminophen if you take 4 of those extra strength 500mg pills you can overdose because the lethal daily take in of acetaminophen is 4 000mg.
what are the negatives to smoking herbs? i know someone who is doing this as he says to help with insomnia. i do not know what kind of herbs they are. he was using some sort of inhaler made of wood then he was using a glass bong. i do not see any positive affects to doing this. any information will be much appreciated.