Mental addiction I can describe as an internal reminder that recalls you how good you felt when you consumed drugs. Yes, you can ignore but it acts like Google alerts showing on your phone frequently and annoying you with phrases like “eat it, come on” or “you will feel so good, take them and relax”.

Physical addiction is worse since your body got so adapted to drugs that it refuses to properly function. Metaphorically, not only you have constant Google alerts telling you to consume drugs, your phone literally starts lagging, glitching and etc. So drugs for you are as issential as an inhaler for asthmatic.