The last of the "Hippy backpackers" grew up and got real jobs in the mid 1980s.
The current "Zoomer" (Gen Z) backpackers are far more sophisticated drug users, as evidenced by the full moon party drug "menus".
Weed is also used by them as a "come-down" from amphetamines, or as a potentiator of other chemicals, such as Acid, psylocybe, MDMA, Ket, etc.
Also, outside of conservative propaganda, there's no scientific evidence that cannabis is a "gateway" drug.