One of my boyfriends is encouraging me to try cocaine, which he says is "great fun". But are there any health risks?

I'LL say there are. For a start, I've recently seen two young people with holes in their noses, as a result of sniffing "coke". Admittedly, hundreds of thousands of people now take the drug and many get away with it. But others suffer heart attacks, strokes, hallucinations, anxiety, depression or paranoia. In America, cocaine is now the commonest drug involved in ER admissions. I really would recommend you steer clear of it.