A possible way to make legalisation more acceptable to the general public is if we adopt a similar system to pharmacy store scripts (The doctor to the pharmacist).
Which means to be able to get recreational drugs, you need to get a appointment with a recreational drug advisor. (As for how frequent, that’s a question best asked to a doctor.)
The advisor is a registered expert that does not need to be trained to a doctor level, but is there to simply keep track of the changes to your body and mind due to these drugs. They can then authorise you to take a certain safe amount. Or direct you to a doctor upon bad effects.
With the scrip, you can head to your local recreational drug store for any drugs categories that your advisor allows for.
Pro: More jobs. Some oversight. Less strain on medical system
Cons: Doctors have better expertise on health effects of drugs.
You can then say this will create new job categories 
Implementation Variations:
- Full: You cannot access drugs at all unless you get advisor authorisation.
- Partial: You can buy very small amount, but for more you need authorisation.
- Psudo: You can buy any amount, but without authorisation the government will excessively tax the drug.