What percent of women in Canada/US and Europe/UK between the ages of
18-35 are social/recreational users of marijuana (approximately 1-2
times per week) and by what percent is usage among that group
increasing?

Ideally, I'd appreciate it if the sources could be some credible big
name news weeklies i.e. Time, Newsweek or similar large newspaper.

The cannabis traffic is much more is extended that the  heroin or
cocaine.  In 1996 1,376 tons of cannabis plants, 2,524 tons of
cannabis  (marijuana) and 813 tons of cannabis resin were seized
(hashish), altogether more than 4,700 tons of cannabis products, much
more that 315 tons of cocaine or the 28 tons of heroin seized that
year.  The hashish seizures have increased in years 90, and in 1996
they were the double of the seized amount a decade before, but the
marijuana seizures lowered in second half of the decade of 1980 and
maintained the lowest level in years 90.

world legal decomisations (per year)

                            1990     1991     1992   1993   1994   1995   1996* 
Marihuana in tons           2,422   1,800    2,330   3,408  2,206  3,044  2,524 
Marihuana (Índex  1985=100) 52      39       50      74     48     66     55 
Hachís in tons              641     890      662     848    977    1,060  813 
Hachís (Índex  1985=100)    177     246      183     234    270    293    225 


In 1996, 69% of the marijuana seizures became in America (of which 52%
in North America, even Mexico), 13% in Africa, 1 1 % in EUROPE and 7%
in the region of Asia and the Pacifico.

In the case of the hashish, 57% of world-wide seizures of 1996 became
in Europe, 27% in Asia (of which most, 25%, became in the region of
Near and the Middle East), 1 1 % in Frica and only 5% in America

HERE IS THE ANSWER!!!

overview:  Considered total number of drug users * in years 90 (annual
prevalence, that is by Io except a consumption in the last 12 months)

Cannabis          141.2      MILLIONS OF USER AT LEAST 1 TIME PER YEAR

 the annual prevalence of the illegal use of the cannabis affects 2.4%
of the world-wide population.  The abuse of the cannabis is a
world-wide phenomenon much more spread that the one of the cocaine
(0,23%) and the one of the heroin (0, 14%).


In several countries, the total illicit drug consumption is considered
more in a third than the total consumption of cannabis.


YOU CAN FIND THIS INFO IN SPANISH HERE:

http://www.unodc.org/adhoc/gass/hoja-i2.htm

KINDEST REGARDS