"... just check out the increasing body of evidence linking cannabis use with mental illness."

Where are your references to this "increasing body of evidence?" I have found the complete opposite in my research, where mounting evidence shows high-CBD pot to be neuroprotective: "CBD may, in fact, be neuroprotective, by slowing or even halting the loss of neurons (National Academy of Science, Engineering, & Medicine, 2017) and may also protect against structural brain harms, e.g. hippocampal neural integrity and volume loss in cannabis users" (Lorenzetti, V. et al., 2016; Yucel, M. et al, 2016; Volkow, ND et al., 2014).

If there's a problem with weed, it is with low-CBD weed that could easily be legislated out of the marketplace. That would require homework and political will, from Morneau to Goodale, to Wilson-Raybould to Trudeau. A group strangely silent on this very important point.