DNA mutations are relatively common. One could probably make a list of causes a mile long. UV rays, different types of foods, errors in the transcription process which are not readily explainable. The list could go on and on. This is one of the ways that cancer cells begin.
Not to say that the mutations from ecstacy and cocaine are not dangerous. Any type of mutation is potentially dangerous and lethal. It depends how much damage there is, and to what part of the DNA sequence.
Not a good thing to be messing around with.
However, and this shouldn't be taken as an endorsement of drug use, evolutionary theory is completely based on DNA mutation.
I call ********. Coca Cola had cocaine in it in the early 1900's, and my grandfather turned out fine. In fact, hes still smarter than me.
Back in the early 1900's, they also knew little-to-nothing about the risks of smoking, fetal alcohol syndrome, cancer-asbestos corrolation, dangers of x-rays (used to have x-rays outside pharmacies, for a nickle you could stand on one and see your feet), benfits of antibiotics or even what DNA was!!!!
That one person survived unscathed (BTW, no real way of knowing that either if he had his children before DNA changes) doesn't mean the risk is any less. Additionally, cocaine was in coca-cola for only a short time and diluted. You were not getting anywhere near the exposure you would get from using cocaine directly.
I just watched X-Men 2 the other day and man I'm going to be doing some serious coke action then. In the movie there were these hot mutant chicks (I think I have a crush on Anna Paquin now) and guys that could do cool things with fire, ice, and various other things.
If it happens in movies it's real, so lets bring on the coke!