They all say that
I gave it up for 5 months without a problem, you just have to make yourself quit for a little while - with coke when you come off it you lose the confidence it gives you which is coupled with coherence, which is hard to get with any other drug, hence it being so "addictive" am glad I've done it all, when I was young about 15 I had a near death experience, and when I thought I was going to die, the only thing I regretted was not trying new things and not doing enough.
So I've always felt like dabbling in almost every drug out there, from Mescaline, Salvia divinorum, to Cannabis. The one's I enjoyed the most were MDMA and Cocaine.
But I tend to stay away from Cannabis and MDMA, which give you psychosis.
I'm not going to be the next River Phoenix, Heath Ledger or join Scientology or claim I was abducted by Aliens or I am god.
I think you have to be a little eccentric to begin with and mentally very strong. I've seen what it's done to some of my best mates some who talk to walls or have turned religious due to bad trips. If you have a bad-trip it is just a reflection of your inner-self your insecurity, your fear of the unknown ect.