You were given the advice, last November to wait 3 years. http://forums.army.ca/forums/threads/35655/post-291827.html#msg291827
A Search, using the word Drugs, brought up many topics and they basically all say the same thing. You will have to wait that period of time and be "Clean" when you reapply to join the CF, both as a Regular Force or Reservist.
This is what the Rules say:
This is an except of Can Forces Admin Orders (CFAO) 19-21 which deals with drug abuse....
POLICY
5. Because of the implications on operational readiness, safety of both
members and the public, security, discipline, reliability, cohesion and
morale, it is CF policy that any unauthorized use or other illegal
involvement with drugs by CF members will not be tolerated. The Canadian
Forces Drug Control Program has been established under QR&O, Chapter 20
as a comprehensive instrument to combat unauthorized use and other illegal
involvement with drugs. The essential elements of the program are
education, detection, treatment and rehabilitation.
PROHIBITION
6. Within the framework of the Canadian Forces Drug Control Program, the
use of any drug by CF members is prohibited, subject to three specific
exceptions. QR&O 20.04 states:
"No officer or non-commissioned member shall use any drug unless:
(a) the member is authorized to use the drug by a qualified medical
or dental practitioner for the purposes of medical treatment or
dental care;
(b) the drug is contained in a non-prescription medication used by
the member in accordance with the instructions accompanying the
medication; or
(c) the member is required to use the drug in the course of military
duties."
The word "use" is defined in QR&O 20.01 for the purposes of the
Canadian Forces Drug Control Program. It means, in respect of a drug, "any
act of injecting, swallowing, inhaling, smoking, ingesting or otherwise
absorbing into the human body."
7. The exceptions to QR&O 20.04 do not constitute authority for
military authorities to order or permit a member to use a drug where that
use, or possession of the drug, is prohibited by another law.
OTHER CANADIAN LAW OF GENERAL APPLICATION
8. Both the Narcotic Control Act and the Food and Drugs Act, which are
federal laws that apply to civilians and CF members alike, define narcotics
and certain other drugs and prohibit a large number of activities in
relation to those substances. Contravention of any of these prohibitions is
an offence punishable by imprisonment and other punishments.
9. Under the Narcotic Control Act, it is an offence to possess, possess
for the purpose of trafficking, export from or import into Canada, traffic
in or cultivate a narcotic. In addition, it is an offence to traffic in a
substance held out or represented to be a narcotic. Recent amendments to
the Act also make it an offence to possess or launder proceeds or property
obtained as a result of trafficking, exporting, importing or cultivating a
narcotic.
10. Under the Food and Drugs Act, it is an offence to possess for the
purpose of trafficking, to export from or import into Canada or traffic in
a restricted or controlled drug. It is an offence to traffic in a substance
held out or represented to be a restricted or controlled drug and to
possess a restricted drug. It is also an offence to sell a drug described
in Schedule F of the Act. Recent amendments to the Act also make it an
offence to possess or launder proceeds or property obtained as a result of
trafficking in a restricted or controlled drug.
The CF has a very strict No Drugs policy.
