[tzamora]

LSD itself is harmless, nevertheless, try not to jump from a balcon while high on it.

[skjsjsnsnsms]

Sure, which is why erowid recommends having a "trip sitter"

https://www.erowid.org/chemicals/lsd/lsd_death.shtml

[watty]

LSD isn't heroin but it's certainly not "harmless".

[aroman]

IANAS/D but it seems that it is, in fact, effectively harmless (in people without severe pre-existing mental disorders, which is to say most people).

Source:

http://en.wikipedia.org/wiki/Lysergic_acid_diethylamide#Pote...