We will encourage you to avoid pursing your lips for any reason, including smoking, within the first 24 to 48 hours. The act of smoking, sucking on a straw, etc., can apply extra pressure to your lips and increase the risk of infection. After a few days post-injection, you can return to your normal routines and habits with no negative consequences.
Apart from the negative health issues associated with smoking, there is no reason why you cannot smoke after lip fillers. That being said, we would like to inform you that smoking is known to dry out the skin and has been linked to premature aging.