If you live in LA you'll need to go over at least one highway.
Edit: ITT many Americans telling me of how walkable and great their towns are. I'm happy for you but comrades, I've been to the US once and that was on a trip I won in high school so don't expect me to know the zoning plan of Providence, Wisconsin Pop. 235'489. I don't really care how lovely your city with two buslines is. For every Seattle or Chicago there are 34 Cincinnatis, Houstons and Las Vagases and approx. 234 exurbs and suburbs.
lung cancer is huge but I think people overlook or just don't know about head and neck cancer. Left untreated you'll be slowly strangled to death by a stinking, fetid mass slowly expanding in your mouth or throat. With treatment, you'll have your tongue or jawbone or cheek or voice box cut out, and then radiated. Many will never talk or eat by mouth again. Many will have to breath through a tracheostomy. Many are disfigured and completely isolated by inability to communicate. and ~50% of the time, it will come back and kill you within 5 years anyway.
I see these people every day and seethe with anger at the tobacco companies that knew smoking did this and didn't care.