Mercury from dental Amalgams is highly tocix and is connected to many health problems such as Autism, Alzheimer's, MS, neurological degeneration etc...
Another impact of mercury is that id depletes certain neurotransmitters in the brain that are replaced by nicotine. Increased mercury levels (below ranges detectable by normal blood and unrine tests) can lead to nicotine cravings.
People with Amalgam are more likely to smoke than those who are Amalgam free.
Could Amalgam be part of your nicotine cravings? It was for me.