Antibiotics and other medication can destroy your hearing. Common anti anxiety medications effect your sense of balance to the point falling.

I don't agree with the GP however. There are significant differences in effect between the strains of MJ that it isn't rational to make statements like the GP.

http://www.m.webmd.com/a-to-z-guides/tc/medicines-that-cause... http://www.drugs.com/clonazepam.html