Well, if you can prove that smoking-related medical treatment is a bigger burden on health care costs (factoring in the taxes collected from tobacco), than the poor diet & exercise issues associated with being overweight, over the lifetime of that person, then I will gladly eat my words. I'm implying that overweight issues cover more conditions that require more medical treatment, starting earlier and more often than smoking related medical issues do.
Since data from Canada are harder to come by, let's look at the US. According to the CDC,
smoking cost $200 billion annually ($190 from firsthand, $10 billion from secondhand), while obesity cost between
$150 to
$215 billion. Tobacco tax (federal plus state) adds up to around $20 billion per year, plus a few billions per year of lawsuit settlement payments from tobacco companies; while still only a small amount compared to the cost, at least these revenues make up for something (I suppose if there were to be a similar situation for obesity, we should start suing McDonald's and the other fast food chains).
What's true though is that the cost of obesity has been rising as the epidemic expanded, having doubled in the past decade. Smoking trends had been on the decline for a few decades (along with the prevalence of its associated diseases), but seemed to have stablized in the past few years as more teens and females offset the decline in male smokers (concomitant with, lo and behold, a decline in male lung cancer rates and rise in female rates).
Obesity also doesn't contribute to many more conditions than smoking; other than diabetes (the big one for obesity), smoking is as much of a risk factor as obesity (and in some cases, a greater risk factor) for various cardiovascular conditions, while also contributing to more cancers and non-cancer lung problems.
And please...pseudoscience is almost completely owned by the anti-smoking brigade (which is why they have convinced almost everyone that "ETS" kills people).
Your credibility just went down the toilet with this one statement. There is as much point in talking to someone who thinks ETS is pseudoscience, as there is in trying to engage a global warming denialist, AIDS denialist, antivaxxer, or cdesign proponentist.