Add the extra feedback suggested by <Someone> so that being blinded
by moving into a stinking cloud is explicitly pointed out to the user. It
makes things more verbose but seems reasonable. You get blinded for 1 turn
with every step, so the message gets repeated each time too, but since you
also get a choking or coughing message on each step it's only a modest
increase in the overall verbosity.
39f3bba86d