Stephen Covey "Seek first to understand, then to be understood". If I ever feel threatened (in any way), my go-to position is to defend myself, and at that point I stop listening. End of effective communication.

I found the following RNZ interview interesting, as regards overall health impacts of legal/illegal cannabis

https://www.rnz.co.nz/national/programmes/saturday/audio/2018749540/how-does-cannabis-use-affect-new-zealanders-health

Findings are based the Dunedin Multidisciplinary Health and Development Study (world reknowned for its' length and breadth). The full report can be found here:

https://www.tandfonline.com/doi/full/10.1080/03036758.2020.1750435

I did ICAM with IMPAC 6 years ago, it was worth doing because of the excellent presenter (Frank McCutcheon).
I often hear 'ICAM' bandied about as it was a kit-set surefire way to undertake a successful investigation, like doing a jigsaw puzzle. This can be (and often is) far from the truth. ICAM is just one tool.

Whenever I hear the phrase 'root cause' I get an internal shudder (similar to when I hear 'common sense'). Both of these phrases are oxymorons.