I used to do my two mile daily run with a Camel, the cigarette for those of you in Loma Linda, hanging out of my mouth. Of course, I was in my early twenties and in great shape already. I wouldn't try that now. Hell, I wouldn't try a two mile run these days.
If you want to take up the vice ("Hobby" is too benign a word for smoking.). Hobby is for collectors, some carvers, and the dilettantes, do so with full knowledge that you are doing nothing beneficial for your body (harm most likely), reducing the amount of discretionary moneys you have and stinking up the house, your clothes, etc. You can call it relaxation, "centering, etc. or justify the behavior through some other semantic. Some people need a crutch (meds, booze, pipes, crocheting, painting or the like, to "relax. Nothing wrong with that, millions of people require a diversion to forget their troubles. Some use diversions (crocheting, pipes, pets, etc.) to abet in addressing stressors/problems, as opposed to a temporary, leaving them to be faced at a later time. Problems/stressors do not disappear or correct themselves.
Smoking is a purely selfish decision and attempting to throw the responsibility of your choice onto others is just ... well wrong and immature. Man up! Make your own choices! And, live with the consequences.
If you asked that question of me, in a face to face conversation, I'd point out all the negatives and the one positive (nicotine), and leave the decision to you. I simply do not want to share in that responsibility.