Some people have difficulty with that, and its hard to change
and the horrible, horrible irony is that the tobacco industries research is world class and open to all as they try to be whiter than white and claw back some of their reputation, and its the *public health research* that is being shown again and again and again to be utterly woeful, full of holes, unrealistically set up, deliberately misleading, failing to compare harm etc yet still gets breathless front page press coverage *every* time it comes out, with no recourse for correction, even before its been formally peer reviewed or published in many cases
Some studies enrolled small samples, and others included small numbers in subgroup analyses, which may explain the lack of statistically significant findings
Key rules include: Smoking is fully prohibited in hospitals, schools, playgrounds, sports fields, and near all types of childcare facilities