Airforce later in life

Hi! I am looking for some advice, I am late 20’s, quit my current career field, I have thought about the military since I was 18 and now I think I want to just do it! However, I am in a legal smoking state (I smoke to help with arthritis) but I know I will need to quit if I join, can anyone give a little insight if you have joined a little later in life? I am not active at all outside of work, but it’s time for a change, I am absolutely terrified to take this step, it’s almost holding me back :(