My name is frownie, I am 27 years old, and I smoke. I smoke just under 10 per day down from the 20 a day habit I had in my early 20's. I am not a leper, I am not disgusting, I am not vile. I am a human being who smokes.
It is my choice and I do try to not smoke around people, for instance I will not smoke in my town center, or at bus stops, or in doorways. I no longer go to pubs/clubs because of the ban that and I can buy a bottle of wine for the price of a glass 
The vilification of smokes is beyond a joke and to some people as one poster has already said they are up there with murderers and pedophiles on peoples moral compass.
I understand that smoking is bad for me and it is my intention to eventually give up. However not yet, I don't want to.
Drinking is bad and can effect other people due to the losing of inhibitions. Drink driving.
What about grossly overweight people, they affect me when I am sat on the bus and they squeeze their ginormous arses in the seat next to me, forcing me into the window. But I cant say that can I?
Have a few facts for good measure: all 2010/11
In 2010/11, there were 1,168,300 alcohol related admissions to hospital based on the broad measure (primary and secondary diagnoses). This is an increase of 11 per cent on the 2009/10 figure (1,056,900) and more than twice as many as in 2002/03 (510,700).
460,000 admissions were estimated as being due to smoking; which has remained broadly similar since 2006/07 (445,000). Of these:
126,200 had a primary diagnosis of respiratory diseases (26 per cent of all respiratory disease admissions);
135,400 had a primary diagnosis of circulatory diseases (15 per cent of all circulatory disease admissions);
160,300 had a primary diagnosis of cancer (11 per cent of all cancer admissions).
I am in no way saying that smoking is OK because it isn't, however alcohol does have a major impact to people and the NHS.