I always thought the hypocrisy between alcohol and cannabis packaging is ridiculous. If cigarettes and cannabis need to be heavily restricted in terms of having simple, plain packaging with health warnings, anything for sale that can cause health issues should be subject to the same restrictions.
Everything will eventually cause health issues. Some substances are quicker to the punch than others, though. To avoid label fatigue, there is merit in limiting use to the worst offenders.
It has only been in the last few years that we are starting recognizing a greater danger in alcohol than earlier realized. And, indeed, Health Canada labelling requirements for alcohol have become more stringent in that time. As we learn more, it is likely the labelling requirements will continue to evolve as well.