People start using cannabis for a number of reasons. The four platforms of Cannabis are Responsible Adult Use, Industrial Use, Traditional Use and Medicine.

Mostly, people start using Cannabis as an act of rebellion or anti establishment, or as a way to irritate their parents. Most teens experiment with cannabis but we believe the majority of people who start using cannabis, stop using cannabis as a rational decision. It is unusual for adults to continue their cannabis use. This is mostly dictated by spouse, family, parenting commitments.

We would say the overriding reason the vast majority of human respond well to cannabis is it keeps them in balance. We believe all use of cannabis is therapeutic, whether it was prescribed by a doctor or bought at the taxi rank. Stress, blood pressure, calm, anxiety, the list goes on as to how and why people use cannabis.

This link may be of interest to you as further reading with references:
https://www.heretohelp.bc.ca/visions/cannabis-vol5/why-people-use-cannabis