A: Informing people of the bad effects it has on your body & informing them on things they can do to help relax their body.
A lot of people who abuse drugs have some underlining reason to it, so informing them that there is a healthier substitute for it is a good way to go. (Ex: if you do posters, it’s good to add phone numbers of hotlines that they can reach out to if they feel like relapsing.)