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"And, like weight, THC content fluctuates." But that's a challenge for other research to solve and with the effects of cannabis being studied in everything from IQ tests to Alzheimer's research and teen smoking habits, every little bit of extra understanding helps.

Find out more at cochrane.org Follow us on twitter @cochranecollab If you are a journalist or member of the press and wish to receive news alerts before their online publication or if you wish to arrange an interview with an author, please contact the Cochrane press office: [email protected] Related resources "Plain tobacco packaging 'may cut smokers by 300,000 in UK'" - BBC News (UK) "Plain cigarette packaging could drive 300,000 Britons to quit smoking" - The Guardian (UK) "UK plain cigarette pack law seen cutting number of smokers by 300,000" - Reuters "Standardised tobacco packaging: will banning branding cut down smoking?" -Evidently Cochrane "Standardised cigarette packaging is on its way, but will it reduce smoking?" - The Guardian (UK)

Most cigar smokers think that dryness is the death of cigars, and that is generally correct

Cancer Is No Joke, So Put Down That Smoke