That is very very easy to show...and it happens all the time.
The biggest example given is when Governments allow the sale of cigarettes to the public by companies.
What Government can say with a straight face that smoking has any benefits to the public health/interest?? People can point to studies on maybe alcohol but what study says one cigarette a day is actually good for you???
There is absolutely zero benefit whatsoever other than the government receiving a
HUGE steady percentage of sales money from tobacco companies (called a "sin" tax) in return for poisoning its citizens. The Government becomes just as addicted to this money than the people are to smoking. This is the absolute worst type of corruption.
Check out this 1984 video about the debate on smoking in planes
"...any more restrictions on smoking in planes would be too much of a headache for the airlines the government said" <- Can you believe this sh*t!
It took YEARS of lobbying and citizen action groups to get most states (unfortunately not all) to enact anti-smoking laws to basically kill big tobacco in the US...because it was "free" money to local governments that they were trying to stop.
US smoking rates have plunged due to fighting tobacco companies which were corrupting the Government with free easy money.
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The sad thing is even if the smoking rate were to drop to zero tomorrow people would still be dying of lung cancer over the next few decades.
Number of cigarettes smoked per person per year
en.wikipedia.org