@glyph I would also put this in the context of marijuana and alcohol that most people are familiar with:
1) there are always negative effects to blowing smoke into your lungs
2) there are always dosages of drugs that will fuck up your kidneys/liver
3) stimulants in unknown doses will damage your heart sooner or later
4) opioids in unknown doses, especially combined with alcohol, will risk hypoxia and death
Addictive behavior causes people to make worse choices wrt to do these risks