Potent marijuana grown indoors in Canada and the United States is easy to buy in Hanoi and Ho Chi Minh City, say regular smokers, and it sells for up to 10 times the price of locally grown weed. That's perhaps surprising given that marijuana is easy to cultivate regionally, and bringing drugs across continents is expensive and risky.
Some experts say the trade can be explained by the dominant role Vietnamese diaspora gangs play in cultivating the drug in Western countries, making sourcing the product and smuggling it to Vietnam an easier proposition than it might be otherwise.
Regardless of the reasons, its availability in Vietnam is a sign of how hydroponic growing techniques have shaken up the global marijuana business.
In the 1960s and 70s, marijuana went from plantations in countries such as Thailand, India and Morocco to wealthy consumer markets in the West. Now, many Western countries are self-sufficient in the weed because of indoor cultivation, and export is on the agenda.
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The smokers sitting outside the Hanoi cafe, a short walk from the city's famed French-era Opera House, seemed proud they were able to buy foreign, expensive buds, boasting their city was like a "mini Amsterdam." But as the tightly rolled joints went round, they struggled to explain why Western weed was available.
Vietnamese diaspora criminal gangs got into the marijuana cultivation business in North America in the 1980s. Having found a niche, they expanded and now account for much of the business across Europe also.