SeraphNebilim

So I just started vaping about 2-3 weeks ago and was told to change the little coil thing every 2-3 weeks. I think I had a .5 originally but the pen came with a .2 one and it's time to change it. Is it safe to use the .2 even though it only says it's .3 compatible on the side or is that dangerous? I'm new so sorry for not knowing all of this.