I'm not overly impressed with studies on smoking from China.
Love living there and love the people intensely.
But nonsmokers in the cities are incredibly compromised lung-wise. The soot from the coal bricks used in cooking etc. is thick in the air. Blow one's nose and the tissue is coal black.
On top of that . . . bureaucrats are known for twisting realities to suit whatever they think their boss wants.
But, hey, I'm confident that smokers will not be the least bit bothered by twisted facts on the consequences of second hand smoke.
Control away on those kids lungs!
/sar
How about one from Europe, and two from the USA? Three of the largest ever done.
I'll give you the details if you want.