You can bring any issue at all to a therapy session. When using Harley Therapy, you can use our search filters to narrow down which therapists can help with the issues you are seeking help with, and check each therapist's profile to review the issues the therapist has noted they can help with.
There is nothing off limits, and your therapist will protect your privacy, barring if you share that you intend to hurt yourself or others, or have committed a serious crime. In such a case, he or she is legally required to contact the right parties or authorities. You can read more about confidentiality here.
(Note that admitting to taking drugs is not considered a crime in the context of therapy.)