By all means, do it. Worst case is that you'll gain nothing but a lot of experience from it, definitely beats sitting on the couch watching TV. I just don't see how this would have any draw for anyone that isn't from your close circle of friends / relatives etc, but I suppose that will also depend a lot on your writing skills. But you should ask yourself why you want to write the book. If it's to gain money from selling it - I probably wouldn't bother. If it's to explore writing or yourself and your surrounding, then you only have to gain by doing it.
Drug experiences are like dreams - the most amazing and important thing in the world to the participant, the most tedious and pointless thing in the entire world to the listener.