I'd encourage you to re-think your views.
"Drugs" is a legal delineation, not one of substance. Like every substance you consume, amount, frequency--and sometimes intent--matter far more than molecular composition.
In regard to LSD specifically, please note that the link to schizophrenia has since been proven null, and the individuals studied were already displaying signs of the disorder. Further research in more recent years, while limited, has been unable to find any correlation between incidents of mental illness and the use of hallucinogenics.
As per cannabis... without it I'd most certainly be addicted to Rx painkillers. I like knowing that if I travel or go somewhere it's prohibited, I won't suffer crippling withdrawals. In fact, aside from the return of a dull aching pain from chronic hyper-flexion, I wouldn't notice anything other than increasingly vivid dreams caused by REM rebound. For me it's a clear choice. It allows me to function, and unlike other pain management regimens, after 7 years its minimum effective dose (MED) despite daily administration remains unchanged; if I skip a day or 6 months, my pain is not magnitudes above baseline.
I'm not here to tout the benefits of marijuana, but to explain how drugs are an indifferent tool, and just because they are harmful in one context doesn't mean we should discount their usefulness in another. Their value is relative.
Because of a substance, I can function. Because I can function, I've been able to nurture my business from 3 people to >500, and into the Fortune 1000. For others with traumatic disorders like PTSD, hallucinogenic therapy may hold promises anti-depressants have been unable to actualize. Regardless, generalizations like yours (while in good faith) prevent the regulatory changes needed to once again allow for open research.
In respect to the diversity of the human condition, I'd implore you to take a more laissez-faire approach: decide what's right for yourself, not for others.