re: What is the worst addiction you've ever quit?

Something is off in my brain. I’ve smoked cigarettes a pack a day, had points where I would drink way too much way too frequently, went through 1/4# of marijuana a week for a couple of years, etc., etc. I’ve never developed a dependence on anything or felt withdrawal symptoms. When I quit I quit cold turkey. I say it’s my brain because I’m impervious to hallucinogens and I’m pretty sure that’s connected.