You're likely getting downvoted because you've made the claim that smokers tend to be sedentary and out of shape without providing any credible data to back tha

You're likely getting downvoted because you've made the claim that smokers tend to be sedentary and out of shape without providing any credible data to back that claim. What you seem to be asking is this: is it the weed, or is it the person's health. The study accounts for that, and is able to determine that there's a higher risk when people are consumers of marijuana, all other factors accounted for.