I discontinued SSRIs several times after being on them long term.I endured the head zaps and chills for a week, and it was behind me.
I took antipsychotics on a few occasions. I don't remember having any problem discontinuing them.
I used klonopin on several occasions. I had no problems stopping it.
I did have difficulty when I decided to quit smoking, but I was eventually successful. (One of life's greatest achievements.)
I like a good bourbon buzz, but I have had several long periods in my life where I chose not to consume alcohol.
It's been close to 5 months since I have had a drink of alcohol. Someday soon, I will celebrate my abstinence!