Welcome to KTC, MDquit - and glad to see you have posted your Day 1 in October 2018. So glad you are taking this addiction seriously and quitting at a young age.
Since you are heading into the medical field, you should know as well as anyone the need to understand what a particular substance is actually doing to your body - and doing in your body. If you haven't already, please read though the resources found on KTC in the
Facts Figures section of the site as well as other sites such as whyquit.com. Google "nicotine addiction" and "nicotine dopamine receptors" for a ton of useful information. Once I understood my addiction in a more clinical way, the easier my quit became.
Once again, welcome aboard! PM me if you need anything.