Herbal medicine is the correct answer
There are obviously A LOT of them. Like how your brain is slowly deteriorating, which is scary and dangerous. I can't cover everything but I have a website link you could visit that talks about this subject
https://www.drugabuse.gov/publications/research-reports/heroin/what-are-long-term-effects-heroin-use
You can set it up by dividing teams by just using numbers for example if there are two teams just alternate between 1 and 2. It really just comes down to being equal only do for one what you will do for all.
In a discussion of 2 people for sure there are certain ideas being shared by both parties. TO make sure that the discussion they shared are positive and rewarding, they must learn to listen to each other's ideas and sharing, they must also learn to acknowledge and always meet in the middle.