this isn't primitive, though they use primitive compounds. i am sure one could find soem tribe in the mtns or jungle to do it in a setting as you describe
i know i say 'i read somewhere...' and then can't find the damn place i read it! :sheppardanime46: however

I read somewhere that ayahuasca has been found to 'cure' ppl of a lot of addictions. from sugar and caffeine to Rx's and street drugs
some ppl have reported recovery after one session but most requiring more then one.
buy anyone can use it, you are guided the entire time and never left alone
check this out. the pre req's and the schedule of events are interesting
imagine contemplating some elongated skulls while on this herb? you are early in the same spot as they are kept so what the hell?
http://www.etnikas.com/ayahuasca-retreat-3-days.php