Starting this thread, OP, you must have anticipated some challenges. Is that what you were looking for? Maybe part of you is not 100% happy with your choices.
Not sure if you're familiar with the Lancet drug harms study published in 2010, which used a structured expert assessment of 20 drugs across 16 harm criteria, measuring harm to users and harm to society. The criteria used, and the findings, are shown here.
Alcohol was assessed as the most harmful drug overall, ranking above heroin and crack cocaine because of its large social and economic impacts. Cocaine is ranked #5 for risk of harm. MDMA, LSD and mushrooms are right down the bottom of the scale.
The authors concluded that the UK’s drug classification system at the time correlated poorly with evidence-based harm rankings, suggesting that drug policy was not aligned purely with the actual harms caused by different substances. However, nothing has changed since then, nor is it likely to.
Just as a point of interest, this is the season for picking liberty caps in the fields.