In the open air I quite like the smell of pipes and cigars, and even some cigarettes (eg Gauloise). And smoke rings can be pretty. Really it's kind of smokers to put their lives at risk to entertain me.

"how come he is able to not smoke at home but as soon as he gets to a festival he lights up? Presumably its not a matter of him being unable to do without smoking, since by not smoking the rest of the time he demonstrates he is, it's because he chooses to indulge on special occasions.

For some people smoking occasionally doesn't work, because they are addicted - but evidently in this case he isn't, so it's surely not a big deal. The health risk involved in occasional cigarettes (provided they really are occasional) is not great, from all I've read.