How does a person become addicted to a drug?

personally for me it a person gets affected to a drug when they use it all the time if they use it frequently just like people become addicted to tabaco and that's why it hard for them to stop the same goes with drugs and people also get addicted because some use it as an escape to their life if there going though something it easier for them to get addicted it a way they can work and they feel good so they start to do it every day but it may feel good to them but it's not especially people around them

answer; (b) i believe the correct answer is : /eliminate health disparities and improve the health of all population groups;

one time i was looking at my neighbors screen door to see if the door was open i was squinting like a fool for 10 minutes before realizing he was starring back i then died from embarrassment and am now typing this from the ghost world