Talking to people about Bitcoin is a normal way to promote Bitcoin and that's the only way I have been using to promote Bitcoin. I don't bring it up unnecessarily, I just wait till they start discussing something that is similar to it, then I will cut in and mention bitcoin and ask them whether they know about it. There are some of my friends that have seen me going through my Bitcoin wallet on my phone and they will ask what the application is and then will tell them it's a bitcoin wallet and also take my time to explain everything to them.
In my case whenever I bought something my friend always tease me about how I am getting rich(an inside joke), what I do is I tell them that its from investing in btc(which is true), thats what makes them interested. They begin to get curious about how can I earn that much in btc. Let's be honest, a person will be interested in something as long as it is an opportunity to earn. So that will be the start of a conversation about btc.
I always explain the risk, the volatility, the patience, a few history and how one should be responsible in investing because it takes a lot of time. So I always tell the truth because if ever they will be interested in btc in the future, they will already know what to expect.