This task force is going against the recommendations of Health Canada on age of access. Health Canada sets 25 as the age limit due to risk of brain development damage and other risk factors. Health Canada also acknowledges that men who want to start a family should not use marijuana due to risk of testicular cancer and sterility and we have science on dna damage - this is a travesty that will be fought as will the fact that the PM - if he accepts legalization takes Canada out of the most ratified piece of human rights legislation ever passed - The Rights of the Child. 
Go look up the disclosure statements for the co-chairs of this task force and then do something to stop this run away train wreck that is headed towards a generation of Canadians. Do something - all teachers, all doctors, all parents acting can stop this. 
18 years of age means kids in school could have legal access. 
If we do not stop this - get ready taxpayers because this generation are going to sue for damages.