We already have an Opioid crises in the US..and this is with legal drugs. Lawmakers are already starting to blame the legal drug dealers and creators for getting people addicted.
If drugs are legalized, a person shouldn't be able to sue the dealer or creator. In the US, it seems like the attitude is "my body, my choice". Until that choice has negative consequences and then the person with the biggest wallet is sued for damages.
I don't really see happening in Portugal.