Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can very well understand your health concern.. The first thing that I would like to tell you is that Smokers tend to have more severe gum diseases as there is a tendency in the gums of the smokers to show less amount of inflammation and symptoms as compared to the severity of the gum disease leading to more damage of the gums before they could become painful or inflamed enough to get treated.. Therefore you should immediately quit smoking as it can cause severe gum diseases as well as cause oral and lung cancers.. Lazers are used now a days for treatment of the gum problems but for cleaning the teeth to remove stains and plaque the traditional scaling technique is only employed.. In case if you find it painful you can ask your dentist and the dentist will use a numbing spray or gel over the gums so they they become numb and you get ease in getting teeth cleaned.. Brown spot on gums can be due to hyperpigmentation known as Smokers Melanosis and it is due to excessive melanin deposition.. Once you quit smoking the overall health of the gums will improve.. You should chew Vitamin C candies or lozenges as it helps in improving gum health.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora..