I have personally known over 50 people with various addictions to every drug out there being used to get high or alter their brain chemistry. And my observations have been that it depends on the person. I have used MDMA, Crack, Ice, Meth, Marijuana, Benzos, Cocaine, all on a recreational basis. The crack was used everyday for about 2 months and I quit it overnight with ZERO problems/withdrawals. Exact same situation for the Ice. I used cocaine at least 2-3 times a week for 20 years. I quit it overnight no problems. I used MDMA for 10 yrs at least once a week and quit that overnight no problem. Used Ice for about 6 months everyday and quit that overnight no problems. Used Speed & Marijuana for my college yrs and quit that overnight no problems. Used steroids while competing on a natl level for 26 yrs and quit over night, no addiction problems,(however dozens of surgery s from joint and tendon problems). I use benzos for over 25+ yrs and they are part of a pain mgmt cocktail I will explain later. But I have stopped using several different type of benzos after yrs of use without any withdrawal. I used alcohol and was a binge drinker buy stopped drinking anything 10 yrs ago,l the taste of booze makes me gag. I have never smoked tobacco ever.
Now for my only withdrawal problem, it started with Norco while I was put on it from a pain mgmt MD15 yrs ago. I have been seeing the same pain mgmt clinic for same pain issues for 15 yrs and I am on Norco, Oxy, Lyrica, Soma & a benzo. When I have tried to stop using the Norco or Oxy it is a fucking nightmare and I can't do it and with my pain issues don't know if I will ever be able to.
Now as for my friends and friends of friends, I have seen them all become addicted to everything mentioned within a week and could not stop without a rehab or dying. The best thing that ever happened for me was that my pain mgmt clinic started doing random drug tests for insurance purposes, and now I don't even think about touching anything other than what they RX me, for the fear of getting the death penalty from the clinic.
So from a real world look of different people taking different drugs, it is subjective at best...