i am drunk right now, so hopefully this doesn't come out too bad.....
but yes, from personal experience i can say that post traumatic stress disorder can be caused by certain bad drug experiences. Since my tripping years, i can say that I now have increased anxiety in certain situations that in some way relate to my experiences on drugs, the biggest is being in a situation full of strangers, with pressures to communicate with them.
however from the research i have done on this topic, these effects are not permanent. and even if they were, the things i have gained out rules these negative side effects by far.
some knowledge about why you are wondering could be useful in trying to help you out however. if you are nervous about trying a drug for the first time, then i would say don't go for it. self fulfilling prophecies are a bitch of a cognitive characteristic.