How can I take extra cals to gain weight...?

Im very slim im 23 yo 5"11 and weigh around 10.3 stone, (although I look less than that) iv been eating as much as I can in a desperate attempt to gain n width on my thin frame, but with my appetite I can only push to around 2000 cals a day, :( iv been taking whole milk for extra cals and wondering will this work?I also smoke aswell and drink whisky :(

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Recommended Answer:

you should probably see a doctor. you aren't healthy to begin with if you physically cant eat that much and your smoking and drinking.

Other Answers:

• Well, i know it sounds really stupid but you can always eat out. For one meal you get about 1000 cal.