Adherence and persistence

What people eat and how much they move: what the measured evidence says each does to mortality, and what has been shown to change either.

How far smoking has fallen and how many deaths it still causes, what vaping is doing to the people who take it up, and what generational bans will show.

What is happening to deaths from alcohol, drugs and suicide, whether they move together, and how much of it is behaviour and how much circumstance.

Isolation, loneliness and mortality: what the evidence shows, how far the relationship is causal, and what interventions have shown.

Infection and pandemics: the risks, and how well prepared we are

Whether a treatment is actually taken, for how long, and what changes either.