Is there anything that I should not bring with me to a session?

My two main requests of what to not bring along to a session are:: NO perfume and being under the influence of any substances (cannabis, alcohol, ect). One area where I receive a lot of information is through clairallience (psychic smell), perfume can interrupt that. And, being under the influence of any substances can block my ability to receive clear information (this is especially true of cannabis).