^ this is why it would be necessary to pre-empt consequences like that and take additional measures like I mentioned to put increased, focused, pressure on sectors of the black market which are the most harmful and detrimental to individuals and communities.
Really it shouldn't be trivial for young people to gain their first access to drugs, illegaly or legally, they ought to realise the gravity of making a decision like that and the impact it could have on them if they are reckless about it.
One other point, measures can also be taken at the other end of the blackmarket supply chain, such as incentivising coca and poppy growers to switch to supplying the government sanctioned side of the market instead of the criminal side.