im not saying ketamine is okay to do by any means. a drug is a drug and they all have risks. but if you are smart and use moderation and common sense you should be fine, just like with alcohol, except you still see many more deaths related to alcohol because of its dangerous nature.
Ah college, the experimenting with drugs, the stretching of boundaries, the philosophizing of lifestyles, and the yearning to be taken seriously by their peers yet still type with no regard for capitalization or proper punctuation.
They were fun times, but I rarely miss them now.
To answer your question, if you were careless enough to do lines off your i7 MBP then I doubt you give a crap about getting some dust on the keys. It'll be fine.