The most addictive substance ive used was a 'bath salt' called amped exuberance powder first taste was on 6/29/2012. Not sure which chemical was in that particular brand but im almost certain it was mdpv. That shit literally had me hooked on bump one. For 5 weeks leading up to a county wide dea raid on every store in my little town ( there were 4 in my town alone which literally only has a small walmart and a couple grocery chains; according to police estimated 1/10 in the town were said to be regular users. The stuff was everywhere all the methheads switched to that until it became officially illegal and eventually disappeared) I did that shit staying up 3-4 days no sleep, sleeping a day or two in between only eating maybe 1-2 times a week. By the end of my literal month long binge, id lost easily 30-40 pounds (was 5'11, 17 y/o, and weighed 170-180 before i started using). I had bruises half a foot wide, up and down my legs from being malnourished. My girl was an emt and found out what i was doing and that ended a 3 year relationship almost instantly. I had sold my 360, all my games, my tv, every dvd in my house, etc. for a stupidly low price.
Never in my life have i seen something take ahold of someone like mdpv (and other analogues of im sure when i would have to go with a diff brand other than amped) did me. The scariest part is through all the shadow people, paranoia, extremely bad health, etc. is I wouldnt hesitate to do that shit right now given the opportunity. If it wouldnt have been for the seizure and arrest of all involved in the sale of that evil stuff I would without a doubt be dead or at the very least have severe brain damage and lasting psychosis.