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Treating pot like a cigar Michael advises first-timers inhale like they're smoking a cigarette and not a cigar -- so take a draw, then take that deep, extra breath to bring the smoke all the way down

To put this into context, between 1993 and 2000 smoking prevalence in South Africa decreased by an average of 0.8 percentage points per year 22

"Simply put, the very same result in terms of smoking rates would have been achieved by doing nothing." Follow James on Twitter., external More on this story Published19 May 2016 Published11 March 2015 Published10 December 2015

Thankfully, as you can see below and at 4:47 in my video , we do have randomized controlled trialsmore than a dozen randomized controlled trials randomizing thousands of people up to 2,000 micrograms of B12 every single day for years, in fact