They found there was a shift in the microbial community in the caecum and distal colon after exposure to smoke
The effect sizes of the interventions were so small that, after receiving the meat-reduction messages, only 1 or 2 people out of 100 actually changed in their meat consumption
Herbal cigarettes can contain similar or even higher levels of tar compared to tobacco cigarettes, along with other harmful substances like carbon monoxide and polycyclic aromatic hydrocarbons
References: Caba, J, 9/11 Attacks Made 1 Million Former Smokers Pick Up Cigarettes Again, MedicalDaily.com, Jun 21, 2013
Although the 1964 Surgeon Generals Report on Smoking and Health criticized candy cigarette makers for trying to lure youngsters to the smoking habit, the sale of these products to children went unchallenged until the 1980s when pressure and adverse publicity generated by organizations such as DOC (Doctors Ought to Care) led tobacco companies to protect their cigarette brands from being used by candy companies

The Lancet also denounced the fact that the majority of the authors of this publication had obvious links with the tobacco industry.[xxviii] The Lancet's criticisms were quickly taken up by the English press, notably in The Guardian, which also highlighted the conflicts of interest of the authors of the article and the methodological weaknesses.[xxix] Immediately after The Lancet, another prestigious scientific journal, the British Medical Journal (BMJ), also criticized Nutt's pseudo-study.[xxx] On 19 March 2016, The Lancet agreed to publish a letter from Nutt and his co-authors in response to its editorial.[xxxi]This letter did not provide valid arguments to counter The Lancets criticisms