It's always hard to say what effects the use of LSD has on the human body, since empirical science has been forced to ignore the use of psychedelics and performing appropriate studies related to their effects, both short term and longitudinal, because of government scheduling. For all we know, what you eat, breath in, and drink may be harming you and your gene pool in ways we have yet to even contemplate. Never mind what the role of mass consumption of pharmaceuticals taken by hundreds of millions of people each day is. You live in a giant petri dish, whether you know it or not, and getting to the bottom which came first, the chicken or the egg, gets more and more difficult with non-stop exposure to potential teratogens and the other multitude of compounds you ingest and/or are exposed to each waking moment of your life. One recent theory, called The Redox-methylation hypothesis
http://www.kadlec.org/uploads/Deth.pdf, begins to try and tackle the issue of the epidemic of Autism Spectrum Disorders from a multi-disciplinary perspective, and tries to factor in and take into account the myriad variables (genetic, environmental, etc.) that may or may not be contributing to this epidemic. So as I digress, I think that trying to account for disease processes of any kind, that because of the kind of world we live in, makes it increasingly difficult to come to valid and reliable conclusions related to LSD use, as in "Will taking LSD cause_________", or anything else, for that matter, and until it is available for scientific scrutiny in real way, all we can do is speculate and use anecdotal information to arrive at any given "conclusion".