"Smoke" joke

Two old ladies were waiting for a bus and one of them was smoking
a cigarette. It started to rain, so the old lady reached into
her purse, took out a condom, cut off the tip and slipped it over her
cigarette and continued to smoke. Sort of a raincoat for her
cigarette.
Her friend saw this and said, "Hey that's a good idea! What is it
that you put over your cigarette?"
The other old lady said, "It's a condom."
"A condom? Where do you get those?"
The lady with the cigarette told her friend that you could purchase
condoms at the pharmacy. When the two old ladies arrived downtown,
the old lady with all the questions went into the pharmacy and asked
the pharmacist if he sold condoms. The pharmacist said yes, but
looked a little surprised that this old lady was interested in
condoms, but he asked her, "What size do you want?"
The old lady thought for a minute and then said, "One that will fit a
Camel!"