The pattern Verb(-て）きます is used to express the speaker's point of view that something has continued to change from the past until the present. Consider; 1. 日本語の授業はだんだん難しくなってきました。 The Japanese class has gradually become difficult. 2. 東京の物価がだんだん高くなってきました。 The cost of living in Tokyo has gradually increased. On the other hand, Verb(-て）いきます shows, from the speaker's point of view, that change will continue into the future. Consider; 3. 日本の人口は、これから　だんだん減っていきます。 (From now,) the population of Japan will continue to decrease. 4. 中国はこれから　いい国になっていくと思います。I think that China will become a good country (to live in, work, etc.) Note: Both Verb(-て）きます and Verb(-て）いきます are used with verbs that indicate change. From the examples above, these verbs are: 1, 2, 4: なる - to become, and 3: 減る - to decrease. If I wanted to say those sentences you asked about, I'd use the following constructions (There may be a better way to say these - Native speakers may offer better options): 1. 今朝、家で朝ご飯を食べなかったので、(ここには）食べに来ました。 I'm not sure about the part in brackets. 2. タバコを吸って、(ここに)来ました。 Again, I'm not sure about how I've used the term in brackets. I hope this was a bit helpful (albeit very long!),and that we can get better input from native speakers.