[Joof]

Tolerance builds so quickly that it literally won't work taken too close together. There aren't physical cravings either.

I feel that it could certainly be done too frequently, but it's very resistant to being addictive. I suspect it would be easier to get addicted to tylonal. I can't comment on other research chemicals, which are often sold under the label of LSD.

Alcohol is well-known to be addictive and has organizations such as alcoholics anonymous to get help.