The LA Times published an interesting article where a Scientologist was interviewed about her take on recent events. Here she explains what Scientology believes about drugs.
Can you discuss Scientologists’ opposition to drugs?
Part and parcel of our principles is that psychoactive drugs are bad for you and limit your spiritual growth. Abuse of them can physically damage your nervous and endocrine systems, and this physical damage can make it so that you can’t benefit from our practices anymore. You’re just too damaged for them to work. So we like to speak out against the abuse of both recreational and “medicinal” psychoactive drugs.