[saas_co_de]

They don't exist. Continuing to repeat reefer madness propaganda does not make it any more true.

Show one scientific study that shows any long term effect from a single dose of any of your listed substances and I will be happy to take your comment seriously.

[tzahola]

"Perceptual disturbances may last for 5 years or more and represent a real psychosocial distress. We reported here a case of a 18-year-old young man presenting HPPD after a mixed intoxication with psylocibin and cannabis. This report shows symptomatic recurrences persisting more than 8 months."

https://www.ncbi.nlm.nih.gov/pubmed/15963699

https://www.newyorker.com/tech/elements/a-trip-that-doesnt-e...

"Evidence supports the association of LSD use with panic reactions, prolonged schizoaffective psychoses and post-hallucinogen perceptual disorder, the latter being present continually for as long as 5 years."

https://www.ncbi.nlm.nih.gov/pubmed/8251869

"Hallucinogen-persisting perception disorder (HPPD) is a syndrome characterized by prolonged or reoccurring perceptual symptoms, reminiscent of acute hallucinogen effects. HPPD was associated with a broader range of LSD (lysergic acid diethylamide)-like substances, cannabis, methylenedioxymethamphetamine (MDMA), psilocybin, mescaline, and psychostimulants."

https://www.ncbi.nlm.nih.gov/pubmed/29209235

"The Association of Salvia divinorum and Psychotic Disorders: A Review of the Literature and Case Series"

https://sci-hub.tw/10.1080/02791072.2015.1073815

[ada1981]

“New Studies Fail To Find Associations Between Psychedelic Drugs And Mental Health Problems“

http://www.iflscience.com/brain/new-studies-fail-find-associ...

[aaaabbbb998877]

Motte and bailey