"The need to establish a link between cigarettes and lung cancers – and the backlash that ensued – changed this. Epidemiology and cigarettes grew up together."

This can be proven now, so the science is pretty clear.

'Global warming' is something that might happen in 100+ years and has many more variables involved. We also don't have politicians and governments using it as a scheme to pull vast amounts of money from one group and give it to another.

I'm old enough to remember the claims in the early 80s that California would be under water in 20 years.

Predicting anything 100 years from now with millions of moving parts is nearly impossible.