Add Bluetooth Source

I controlled the gas sensor through Arduino. I want to add Bluetooth Source here.
Outputs to smartphones by connecting LCD values to Bluetooth

#include <LiquidCrystal.h>
LiquidCrystal lcd(7,6,5,4,3,2);
int redLed = 10;
int greenLed = 12;
int buzzer = 8;
int smokeA0 = A0;
int sensorThres = 300;

void setup() {
pinMode(redLed, OUTPUT);
pinMode(greenLed, OUTPUT);
pinMode(smokeA0, INPUT);
Serial.begin(9600);
lcd.begin(16,2);
}

void loop() {
int analogSensor = analogRead(smokeA0);

Serial.print(“Pin A0 :”);
Serial.println(analogSensor);
lcd.print(“smoke Level:”);
lcd.print(analogSensor-50);

if (analogSensor-50 > sensorThres)
{
digitalWrite(redLed, HIGH);
lcd.setCursor(0, 2);
lcd.print(“Alert…!!!”);
digitalWrite(12, LOW);
tone(buzzer, 1000, 200);
}
else
{
digitalWrite(redLed, LOW);
digitalWrite(12, HIGH);
lcd.setCursor(0, 2);
lcd.print("…Normal…");
noTone(buzzer);
}
delay(500);
lcd.clear();
}

Apply voltage through gas sensor.
If the amount of gas is 300 or more, the buzzer will sound.
If the gas volume is less than 300, you can’t hear the buzzer.

You should get something by Serial.printing the same values you are lcd.printing, connecting Bluetooth to pins 0,1 and that's about it.

You might find the following background notes useful.

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino