hi and welcome to HCM,
is indeed a injurious habit , it has affects the general health of an individual as well as oral health.
Tobacco smoking causes inflammation of the oral tissue and greatly influences the periodontal health.
it causes gingival inflammation
, redness ,bleeding gums
First thing you can do is try and get rid of the habit , you can use habit breaking lozenges available in market like nicorett tablets ,chewing gums which will help breaking the habit.
i suggest you to go for thorough scaling and root planing of teeth by a dentist
foloowed by a course of medication will restore good gum health.
Go for professional gum cleaning every 4 months, use antiseptic mouth wash like chlorhexidine
for oral rinsing .