When you rehearse yoga, you are NOT REQUIRED to quit smoking. In any case, in all decency I need to specify that after you start your practice, you may find that you would prefer not to keep smoking.
Yoga stresses fitting breathing and can enhance your oxygen limit. You may see the advantages and changes are more evident in other people who don't smoke, and after that choose to surrender smoke yourself.
This is altogether an individual choice.
You may think about whether you have to change your way of life to practice yoga. The answer is NO. It doesn't require that you quit or decline. You don't need to end up a vegan or change your diet. Nor do you need to surrender drinking or smoking. Then again, you may see that your tastes change after you start to practice yoga. As you get to be more subtle and tuned into your body, you MAY feel distinctively about the effects indulging, smoking and drinking liquor have on your body. Having practiced yoga for a long time have the greatest alteration in lifetime about the more mindful choice of dietary rules.