1. My comment stated "36.5 percent of adults are obese. Another 32.5 percent of American adults are overweight".

Among men, the prevalence of obesity was over 8 percentage points lower in Canada than in the United States (24.3% compared with 32.6%) and among women, more than 12 percentage points lower (23.9% compared with 36.2%):

https://www.cdc.gov/nchs/products/databriefs/db56.htm

12 and 8 percentages are fairly higher in comparison - especially when we are talking about percentages. USA which has 9-10x the population of Canada, 12% makes a very big difference.

3. You are severely underestimating the tourism. Yes, tourism in USA in winter is very high. Canada tourism in winter is significantly lower due to extreme cold weather. Almost all the trips for cruise ships, water parks (Disney), famous cities, national parks etc happen in USA. The snow season in Canada prevents all those.

https://www150.statcan.gc.ca/n1/daily-quotidien/200221/dq200...

> The number of tourists from overseas countries (countries other than the United States) rose to 7.1 million arrivals (+454,000) in 2019, while the number of US tourists to Canada rose to 15.0 million (+554,000). The summer months—June through September—were the peak months for tourism arrivals from overseas to Canada, representing 51.9% of all arrivals from overseas during 2019. By comparison, the peak months for tourism arrivals from the United States were May to October, with 68.8% of all US tourist arrivals to Canada.

> Canadian residents returned from 4.8 million trips abroad in December, up 2.9% from the previous month. Of these 4.8 million trips, 3.8 million were to the United States, up 3.3% from November. Almost three-quarters of these trips to the United States were made by car. Same-day car trips across the border edged up 0.4% to 1.8 million in December, while the number of return trips from overnight car trips rose 9.4% to 966,000. The number of plane trips to the United States rose 1.5% since November to 877,000. This was 4.7% higher than in December of the previous year. In December, travel to overseas countries by Canadian residents rose 1.8% to 1.1 million trips—the highest level on record for the month of December.

Now lets look at the opposite for tourism to USA:

> In 2019, the number of international tourist arrivals to the U.S. stood at almost 80 million after being on the rise for over a decade. 47.88 of that came from Americas (Canada being the first followed by Mexico).

https://www.statista.com/topics/1987/travel-and-tourism-indu...

https://www.statista.com/statistics/1012283/united-states-in...

> In 2019, there were approximately 20.72 million overseas visitors from Canada to the United States. The visitation figures from Canada peaked in 2013 when the U.S. received a total of 23.41 Canadian citizens across its borders. In 2019, Canada placed first in terms of the most visitors from one nation to the United States, followed closely by fellow U.S. neighbor, Mexico.

https://www.statista.com/statistics/214764/number-of-visitor...

A large number of Canadians in the Niagara region also cross the border for simple stuff like cheaper goods. Nobody does the opposite.

Also international travellers from Canada often fly through US but not vice versa. When I have to visit my home in South Asia, it's always cheaper for me to fly through US. This is not true for the opposite.

And even the ones who visit places in Canada like Toronto and Niagara Falls visit New York too. And a lot of tourists come from Canada who visit places in south like Florida. Anecdotal - I know 3 families here with whose retired members all spend their winters in Florida and another family which spends it in Austin Texas.

4. Like I said, you sliced my point in half and ignored the rest of my comment where I state "This density is even bigger factor for COVID and crazy dense cities." Look at the population density of the 10 highest dense municipalities in Canada (highest is 5,492.6 people per square kilometre in Vancouver, B.C.):

https://www150.statcan.gc.ca/n1/daily-quotidien/170208/t001a...

Now compare it to USA. Top 50 cities amongst them all are signifiantly higher than the Canadian numbers. New York City alone is 10,431.1 people per square kilometre, San Francisco is 6,658.9, Boston is 5,143.4):

https://en.wikipedia.org/wiki/List_of_United_States_cities_b...

5. False. From NYTimes: "Travel From New York City Seeded Wave of U.S. Outbreaks: The coronavirus outbreak in New York City became the primary source of infections around the United States. That helped to fuel outbreaks in Louisiana, Texas, Arizona and as far away as the West Coast. The findings are drawn from geneticists’ tracking signature mutations of the virus, travel histories of infected people and models of the outbreak by infectious disease experts":

https://archive.is/fEPG7