From my observation, obesity, smoking and alcohol/drug abuse all lead to a rather unpleasant last decade or two of life, if not an early grave.
The lifelong smokers I've known have developed COPD, shortness of breath, bouts with cancer, an inability to climb more than a few flights of stairs, and/or require oxygen supplementation. They may live longer than obese people, but their lot is far from pleasant.
Lifelong alcohol/drug abusers tend to develop all manner of health problems that are difficult to survive.
Severely obese friends in my age group (BMI over 40) have nearly all developed several of the following: serious knee and hip problems, mobility issues, high blood pressure, type 2 diabetes, sleep apnea, red flags in their blood chemistry tests and last but not least, great social discomfort due to their size.
My point is that none of the above should be encouraged.
I'm disheartened by the normalizing of obesity that's occurred in the past decade. In a quest to not "fat shame" (and I agree we shouldn't), are we unintentionally giving tacit permission to young people to become morbidly obese, ruining their health in the process?